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Mitchell Peterson
Mitchell smiling (a rare sight)
Voiced by: Spencer Drever (season 1), David Raynolds (season 2), Dylan Schombing ("One Small Step")
Mitchell Peterson is a nerdy and socially awkward neighbor of Jet's who is an aspiring detective. Many episodes feature him spying on Jet to find proof that he is an alien, as well as him trying (and failing) to expose him to the neighborhood. He often acts a callous, anti-social, and prideful Jerkass, but this is all a charade to hide his loneliness deep inside. Mitchell has an accomplice in the form of his dog, Cody.
  • Adorably Precocious Child: Though all the kids in the show qualify for this trope in their own right, Mitchell in particular stands out. He may be little, but he made an exact cake replica of Saturn V in one episode.
  • Adorkable: Mitchell can be this when he's not being a jerk, especially in the episode "Solar System Bake-Off!". He's also adorably awkward and shy when he recites his poem about Earth in "Every Day is Earth Day".
  • Agent Scully: Unlike Mindy and Lillian, he doesn't believe Halloween is magical and doubts that the witch they saw fly across the moon in "Jet's First Halloween" was real. In "Our Sun is a Star!", he somehow doesn't believe that there are other suns in the universe.
  • Ambiguously Bi: Mitchell has a ton of subtext with Mindy, as well as occasionally coming off a Stalker with a Crush towards Jet. Not helping is this line from "Holidays in Boxwood Terrace":
    Mitchell: I need to get closer to Jet.
  • Anti-Hero: He appears to be heading in this direction. Mitchell can be sarcastic, condescending, and harsh towards the group, but he has a few Pet the Dog moments that show that he can be nice. "Holidays in Boxwood Terrace" has Mitchell trying to figure out how to be part of the group, which shows that Mitchell just wants to have friends.
  • Attention Whore: Especially in "Racing on Sunshine". The way his face looks as he comes in before the race starts just says it all.
  • Becoming the Mask: At least implied. As shown in "Holidays in Boxwood Terrace", Mitchell fakes his jerk attitude to hide his loneliness and social insecurity. Even after he befriends the other kids in this episode, he still acts like a jerkass in some episodes of season 2, although he's mellowed out a lot more. Since he is shown acting rude towards the other kids in many episodes of season 1, it is implied that he's been hiding behind his jerk mask for so long, that it's become a part of his personality, and its something that he can't shake off, at least for the time being.
  • Berserk Button: Woe betide anyone that dares sneak up on him.
  • Big Damn Heroes: In the one-hour special "One Small Step", Jet, Sean, Sydney, Mindy, and Sunspot land their saucer in Little Dipper Lake, where the saucer sinks and they almost drown. Luckily, Mitchell, who was in a rowboat at the exact same time, came to their rescue and they hopped upon his rowboat. Out of gratitude, Mindy invites him to the sleepover.
  • Brainy Brunet: Mitchell is definitely brainy, and he has brown hair as shown from underneath his hat in "Jet's First Halloween".
  • The Cameo: For no apparent reason, he made a cameo in "Sunspot's Sunspot".
  • Canine Companion: His dog, Cody.
  • Cassandra Truth: Whenever Mitchell tries to expose Jet, nobody believes him:
    • This was first seen in his debut episode "Mindy's Moon Bounce House", but instead of trying to expose Jet, he tried to tell his mom that he saw Mindy floating by on a kite string, but then Mitchell's mom just says that she's glad that he has such a "wonderful imagination".
    • In "Kid-Kart Derby", Mitchell tried to expose Jet before the race even started, by claiming that he put some sort of alien technology into his kid kart (Jet borrowed some junk from the DSA for his kid kart), but Jet gets off the hook because Mr. Peterson tells Mitchell that what Jet did was "recycling".
    • Expertly played with in "Back to Bortron 7". In order to keep the Propulsions' alien identity a secret, Jet 2 has to project a hologram of their house so that no one would notice that they were gone. However, Jet 2 later has trouble keeping the hologram stable, which leads to it glitching. Mitchell even stays up all night to prove to his parents that the Propulsions are aliens from another world. However, when he takes his father outside, the hologram is perfectly fine, which leads to Mr. Peterson scolding Mitchell for waking him up at 2:00 AM. When the Propulsions are just about to land back on Earth, the hologram disappears completely, and then Mitchell tries to expose Jet's secret to the entire population of Boxwood Terrace, however Jet 2 causes an eclipse which distracts the townspeople from seeing the Propulsion house land back on Earth. Mr. Peterson scolds Mitchell again, telling him that he has quite an imagination, but Mitchell claims that he has no imagination.
  • Character Check: Even though Mitchell has been taking a level in kindness in Season 2, in "Our Sun is a Star!", he's just as mean as he was in Season 1. However, this episode takes place in January, and Mr. Peterson is shown taking down Christmas decorations, so it's possible that this episode could have taken place after "Holidays in Boxwood Terrace", where Mitchell becomes part of the group. That episode was one of the very last Season 1 episodes, and Mitchell didn't start becoming nicer until "Try and Try Again", a Season 2 episode.
  • Character Development:
    • Mitchell was a bit naive in season 1, as he actually believed Jet when he told him (in his alien costume) that he was from Bortron 7 in the Halloween Episode. Come season 2, however, Mindy explicitly tells him that she went to the moon, and even holds up a moon rock, but Mitchell doesn't believe her.
    • He also seems to take a level in kindness in season 2. He still has his mean moments, but he's mellowed out a lot more and often helps out the kids, sometimes even being a complete sweetheart.
  • Child Prodigy: Mitchell is extremely smart for his age.
  • Companion Cube: The episode "Sean's Robotic Arm" reveals that he has a Sherlock Holmes figure.
  • The Cutie: Just look at him.
  • Deadpan Snarker: Mitchell is the defining example of this trope in the show. For example, in "Detective Mindy", Mindy tells Mitchell that she was working on the case of "what Mitchell's doing", and then she giggles. Mitchell's response? "Yes, very funny."
  • Defrosting Ice King: Mitchell starts out as a withdrawn jerk who acts like he hates the main characters. Slowly, later episodes reveal that he does have a kind side. Following the reveal of his true nature in "Holidays in Boxwood Terrace", he starts to defrost completely in season 2.
  • Depending on the Artist: The animators just can't decide on whether he should be taller or the same height as Mindy.
  • Depending on the Writer: Mitchell can either be a stoic but respectful child ("Solar System Bake Off", "Sunspot's Night Out") or a major Jerkass ("What Goes Up...", "Kid Kart Derby").
  • Didn't Think This Through: In "Kid-Kart Derby", Mitchell finds the plans for an ion drive and installs it in his kart, but it does not work because Mitchell didn't read farther down in the plans.
  • Distant Reaction Shot: At the end of "What Goes Up...", Mitchell screams at the sky, and his scream is so loud, that the camera zooms out on the Earth.
  • Don't Sneak Up On Me Like That:
    • Mitchell hates it when people sneak up on him. In the episode "What Goes Up...", Mindy sneaks up on Mitchell as he is spying on Jet. He gets very startled. No violence is involved, since this show is for young children.
    Mitchell: ...Mindy?!? Don't sneak up on me like that!
    • In "Holidays in Boxwood Terrace", Mitchell berates Jet for unintentionally sneaking up on him.
  • Earn Your Happy Ending: In the Christmas Episode, Mitchell's predicament was that he wanted to be a part of the group, but can't quite figure out how to fit in. He had to sing an Award-Bait Song with them in the pageant in order to be welcomed into the group.
  • Failure Is the Only Option: No matter how many times Mitchell tries, he just can't successfully expose Jet, because in this universe, the identity of the Propulsions is apparently the Cassandra Truth.
  • Fainting:
    • He faints at the very sight of Mindy in "What Goes Up...", as well as in "Jet Shrinks the Kids".
    • He also faints at one point in "That's One Gigantic Pumpkin, Jet Propulsion!".
    • He faints in "Our Sun is a Star!".
  • Fanboy: Appears to be one to Sherlock Holmes. He dresses up as him for Halloween, and even has a toy of him.
  • Fatal Flaw: Pride. He often lets it get to his head, which inevitably leads to his downfall. See Never My Fault below for more information.
  • Foil:
    • To Lillian. They are both Mindy's friends, but while Lillian is ditzy and nice, Mitchell is smart and blunt.
    • He's also a foil to Sean. They are both the intelligent, level-headed, voice of reason within their respective groups, and they're both adorkable and have Youthful Freckles. However, Sean is more open, while Mitchell tries to shut himself out from everyone else. Sean is also friendlier than Mitchell.
  • Friendly Enemy: Mitchell is this to Jet and his group. Mitchell is rude to the group, but he can get along with Jet and Mindy sometimes. He also tends to help them out, especially in "Eye in the Sky" and "Sean's Robotic Arm".
  • Good Luck Charm: "Magnet, PI" reveals that Mitchell wears a lucky magnet under his jacket.
  • Happy Dance: Mitchell does a dance upon uncovering the treasure in "Treasure Map".
  • Hidden Depths: "Eye in the Sky" shows that he is an expert on weather.
  • Hidden Heart of Gold: Mitchell hides behind a facade as revealed in the Christmas Episode. Mitchell acts mean to Jet and his friends, and Mitchell claims that he "doesn't do friends", but Mitchell isn't really mean, he's really just a lonely kid who wants to join Jet's clique, but doesn't know how to fit in. Fortunately, he gets his happy ending.
  • Hypocrite: In "That's One Gigantic Pumpkin, Jet Propulsion!", he berates Jet for singing to his pumpkin, yet Mitchell insists that simply talking to pumpkins is perfectly normal kid behavior. Also, he calls it a "specimen" and his "precious".
  • I'm Not Here to Make Friends: In a non reality show example, in the Christmas Episode, Sean asks Mitchell if he wants to join them, saying that "you are our friend", but Mitchell claims "he doesn't do friends". Of course, he's lying.
  • Inferiority Superiority Complex: Mitchell seems to suffer from one. It's very obvious that he has an inflated image of himself (see It's All About Me below), and sometimes acts like he's better than Jet and the gang in the contest-focused episodes. Underneath, though, he seems to be emotionally insecure. He's socially awkward/shy and tries to act tough to hide it. "Try and Try Again" has him try to impress the other kids with his kick scooter, but gets nervous when they come to see it.
  • In Touch with His Feminine Side: He wore the lavender nightgown in the Christmas Episode, and he wears Mindy's sparkly unicorn helmet with pride in "Try and Try Again".
  • It's All About Me:
    • Mitchell seems to have a bad case of this as shown in "Kid-Kart Derby". When he wins the soapbox derby, he is the only one cheering for him and even asks anyone if they wants autographs from him, but instead everyone is looking up at and cheering Jet (who was parachuting) even though he lost the derby. Mitchell is the complete opposite of Jet, who is very selfless and tries not to expose his alien identity because he doesn't want to be a celebrity and leave his friends.
    • Also in "Racing on Sunshine", before the race starts, Mitchell boasts that he was "ready to retire", but Cody convinced him to race again. Needless to say, the other racers weren't amused.
  • It's for a Book: In the episode "Solar System Bake-Off", Mitchell sneaks into Jet's house to gather info on Mindy's baking contest entry. He writes down some information in his notebook. When Sydney asks what he's writing in there, Mitchell says its for a cookbook. Or a blog. Or webisodes.
  • I Work Alone: It isn't said verbatim, but Mitchell usually rejects help from other characters when trying to solve his cases, claiming that he needs to solve his mysteries himself, as shown in episodes like "What Goes Up...", "Kid-Kart Derby" and "Mindy's Mystery". However, this trope averts in "Detective Mindy" where Mitchell actually lets Mindy help him.
  • Incoming Ham: "What kind of Earth pet parachutes? Someday I'll figure that Jet Propulsion out. Someday. JET PROPULSIONNNNN!!!!!!!!"
  • Jerkass: He is probably the biggest jerk in any preschool show of the 2010s.
  • Jerkass Has a Point: In "That's One Gigantic Pumpkin, Jet Propulsion!", Mindy and Lillian keep insisting that Halloween is magical, while Mitchell repeatedly refutes their claims. Yes, he was rather blunt about it, but he did have a point that the stuff that they said were real like demonic spiders, ghosts, and witches are fake.
  • Jerk with a Heart of Gold: Though Mitchell has his many jerky moments, Mitchell can be genuinely nice at times. Episodes showing this are "Solar System Bake Off", "Detective Mindy", and "Sean's Robotic Arm".
  • Karma Houdini: Mitchell tried to get intel about Mindy's recipe in Solar System Bake Off and cheated at a race in Kid Kart Derby, but he never gets punished for this.
  • Kid Detective: The defining example of this trope. Mitchell is always trying to be a detective and find proof that the Propulsions are aliens. In "Detective Mindy", Mindy becomes Mitchell's detective partner.
  • Leitmotif: Mitchell's appearances are usually marked by a jazz snippet that wouldn't sound out of place in a noir film, fitting his Kid Detective status.
  • Limited Wardrobe: Except for "Jet's First Halloween", Mitchell seems to never change clothes.
  • Loner-Turned-Friend: Mitchell was previously a Shrinking Violet loner with a Jerkass Façade, who wanted to join Jet's clique but didn't know how to fit in. However, once he sings with them in the pageant, he gets to belong to the group. Sydney and Mindy reassure him that he can always be a part of whatever the clique is doing. So Mitchell is technically now part of Jet's circle of friends.
  • May I Borrow a Cup of Sugar?: In the episode "Solar-System Bake Off!", Mitchell goes to Jet's house and asks for a cup of sugar, but really, he wants to gather information about his (speculated) crush Mindy's baking contest entry.
  • Meaningful Appearance: He has emerald-green eyes, due to him being an Earthie, intuitive, and passionate about what he does. His green eyes, along with his bright red clothing, nerd glasses, and large hat, also make him stand out the most out of the recurring cast, (due to being the most important), meaning your eyes are naturally drawn to him.
  • Meaningful Name: Mitchell has the word "hell" in it, which is what he tries to make Jet's life. However, the name Mitchell means "who is like God", which shows that underneath Mitchell's jerk facade, Mitchell is truly nice.
  • Megane: Mitchell is often very Adorkable, and his Nerd Glasses add to this.
  • Missing Mom: Mitchell's dad is always shown, yet his mom has never been seen. She was only heard in "Mindy's Moon Bounce House".
  • Mobile Shrubbery: Mitchell often hides inside an object and moves around while spying on the main cast. For example, he hides inside a present in "Holidays in Boxwood Terrace", and he hides inside a bush in "Jet Shrinks the Kids".
  • The Napoleon: Mitchell is a little kid with big temper issues.
  • Nice Hat: Mitchell has a detective hat.
  • Nice, Mean, and In-Between: He's the Mean to Lillian's Nice and Mindy's In-Between.
  • Nerd Glasses: Mitchell wears these kind of glasses.
  • Never Bareheaded: Mitchell is never seen without his hat on.
  • Never My Fault: In "Racing on Sunshine", the kids have to design solar-powered karts for the annual kid-kart derby. During the race, it gets cloudy. Jet and Sydney have batteries installed in their kid-karts so they can use the sun's energy later, but three-time champion Mitchell got too overconfident in winning the race, and did not think to use the battery. He ends up coming in at 3rd place, and he blames the clouds blocking the sun instead of his own carelessness.
  • No Social Skills:
    • Mitchell in the episode "Solar System Bake-off!" When he spies on the gang in order to gather information, he acts awkward and almost robotic around them, especially around Mindy. Before he entered the house, he was even thinking of what he should say to them.
    • He also acts especially shy when Mindy compliments his rocket cake.
    • Taken to insane levels in the Christmas Episode, where despite Mitchell acting mean to the gang like he usually is, he's really just acting that way because he doesn't know how to fit in.
  • Not So Above It All: Mitchell acts like he is a better detective than Jet and his friends, but he still attends Mindy's concert at the end of "Mindy's Mystery".
  • The One Guy: In his group with Mindy and Lillian, he's the only male.
  • One Head Taller: Mitchell is roughly a head taller than Mindy, and he possibly has a crush on her.
  • Only Child Syndrome: Like every other kid on the show, he is an only child.
  • Only Sane Man: In his circle with Lillian and Mindy, where he's the only one who isn't convinced that Halloween is magical.
  • Pet the Dog: Mitchell sometimes antagonizes the main group, but he can be nice to them. For example, he went to Mindy's concert in "Mindy's Mystery" despite being a huge jerk to her in that episode.
  • Perpetual Frowner: His default facial expression is a frown. He is very cute when he smiles, though.
  • Pride: Mitchell is quite prideful and overconfident. In fact, this is what causes him to lose the derby in "Racing on Sunshine".
  • Red Oni, Blue Oni: In two ways.
    • Mitchell is the Red Oni to Jet's Blue Oni. Mitchell often gets irritated, while Jet is more optimistic and patient. Fittingly, the former wears red while the latter wears blue. Mitchell could also be seen as the Red Oni to Mindy and Lillian's Blue Onis because those two are also calmer than he is.
    • Mitchell is also the Blue Oni to Jet's Red Oni. Jet is super excitable and often leaps before looking. Mitchell, on the other hand, is calmer than he is and more pragmatic. He is also the Blue Oni to Mindy and Lillian's Red Onis because those two are very energetic.
  • Red/Green Contrast: He has red clothing and green eyes.
  • Running Gag: Mitchell spying on Jet.
  • Savvy Guy, Energetic Girl: The Savvy Guy to Mindy and Lillian's Energetic Girls. Mitchell is the Only Sane Man of their little group and is more logical.
  • Secret Chaser: Mitchell is one of the defining examples of this trope. Mitchell is almost always trying to find proof that the Propulsions are aliens.
  • Ship Tease:
    • Mitchell has a ton of ship tease with Mindy.
    • In Mitchell's debut episode, he watches Mindy very intently. In "Solar System Bake Off", Mitchell acts very nervous around Mindy when he tries to get information about her recipe. In "Detective Mindy", Mitchell lets Mindy be a detective with him, and they bond after solving the case of the missing sunglasses. At the end of the episode, Mitchell gets down on one knee to propose that this is the beginning of a beautiful friendship for him and Mindy. . Cue the older kids cheering after he says that. In "Mindy's Mystery", Mitchell was mostly mean to Mindy and her friends, but then he is shown at the end of the episode at Mindy's concert.
    • In "Sean's Robotic Arm", Mindy hugs him. He looks surprised at first, but then smiles warmly at her as she pulls away.
    • At the end of "One Small Step", Mitchell rescues the kids from drowning in the lake with his rowboat. The kids head off to have the slumber party in Jet's backyard. Mindy goes back and invites Mitchell to sleep over as well. Mitchell has a huge smile on his face, stammers a bit, and says he's in. Mitchell and Mindy escort Jet 2 to the backyard together. At the backyard, while the older kids, Jet 2, and Carrot and Celery are sitting around the campfire, Mitchell and Mindy are off to the side playing mini-golf, just the two of them. They also sing together.
  • The Short Guy with Glasses: He's one of the shortest characters in the show, and he wears a pair of glasses.
  • Shrinking Violet:
    • Mitchell was this in the episode "Solar System Bake-Off!" where he acts rather shy around Jet and his friends, especially Mindy.
    • Taken Up to Eleven in "Holidays in Boxwood Terrace".
  • Singing Voice Dissonance: His singing voice in the Christmas Episode is much more high-pitched compared to his speaking voice.
  • Skyward Scream:
    • Mitchell screams Jet's full name at the end of "What Goes Up...", after proclaiming that he will figure out Jet's alien identity one day.
    • He also does this at the end of "Pet Sounds".
  • Smart Jerk and Nice Moron: The Smart Jerk to Lillian's Nice Moron. Mitchell is quite smart for a kid his age, and he's also very blunt and snarky, with a high-and-mighty attitude at times. Lillian, on the other hand, is ditzy and forgetful, but makes up for it with her politeness and sweetness.
  • Smart People Wear Glasses: Mitchell is very smart, and he even wears nerd glasses.
  • Spell My Name with an "S": His surname is often spelled as Petersen.
  • The Spock: Fills in this role in the Freudian Trio with Mindy and Lillian. Mitchell is socially awkward, a Perpetual Frowner, highly intelligent, and doesn't easily believe in the supernatural.
  • Spoiled Brat: Mitchell is a downplayed example of this trope. In "The Grandest Canyon", when he and his father look at the Propulsions' pictures of Valles Marineris, Mitchell whines that the hats that the group wore in the picture were not at the store that was at the canyon that the Petersons went to. Also, in "Mindy's Weather Report", Mitchell whines that the sandbags are too heavy, and his father spoils him by carrying his sandbag for him.
  • Stalker with a Crush: Mitchell seems to be this in his debut episode, "Mindy's Moon Bounce House", where he watches Mindy through a pair of binoculars. He later tried to get intel about her recipe in "Solar System Bake Off!" However, the tables turn starting in "What Goes Up..", where Mindy becomes the stalker, by constantly sneaking up on Mitchell.
  • Stalker Without a Crush: Unlike the above trope, Mitchell spies on Jet because he wants to find out if he's an alien, not because he has a crush on him.
  • Straight Man: To Mindy and Lillian.
  • Sugar-and-Ice Personality: While Mitchell often acts like a harsh jerk in some episodes, in other episodes he's pretty compassionate and reasonable.
  • Talking to Plants: In "That's One Gigantic Pumpkin, Jet Propulsion!", he talks to his pumpkin, claiming that its perfectly normal kid behavior, and calls it his "precious".
  • Tall, Dark, and Snarky: Fits the trope like a glove. He is the tallest "little kid" on the show, has dark brown hair, and is a Deadpan Snarker. No wonder Mindy likes him.
  • Token Evil Teammate: Since he's somewhat part of Jet's friend group, he is this trope due to still somewhat being a jerkass, as well as still trying to find out Jet's identity. However, he's by no means evil.
  • Took a Level in Kindness: Mitchell is considerably mellowed out in season 2, especially in the second half. He was a jerk in season 1, and by the end of that season, he gets to be in Jet's friend group. While Mitchell still has his occasional rude moments, he seems to get along with Jet and the gang a lot more. This makes sense when you consider that their his friends now. And he is an utter sweetheart in some episodes, most notably "Try and Try Again" and "Sean's Robotic Arm".
  • Tsundere: Along with Helga from Hey Arnold! (which is from the same creator), Mitchell may as well be the defining example of this trope. Mitchell constantly flip-flops from being stoic, yet respectful to be a cold, anti-social Jerkass spy.
  • Vague Age: Mitchell is either taller or the same size as Mindy, and does not know how to spell "electric engine" yet can make a replica of Saturn V and somehow managed to acquire an ion drive.
  • Vocal Evolution: His voice got raspier by the end of season 1. In season 2, he has an all-new VA, and his new voice is much more hammy. He gets another new voice actor in "One Small Step", and now he sounds more like a tomboyish rugrat than anything else.
  • What Happened to the Mouse?: In "Magnet, PI", we never find out what Mitchell's "top-secret" detective case was. When he appears again at the end of the episode, he only wonders why Sunspot appears to be tap-dancing on the ceiling, and is then dragged away by Cody.
  • Wise Beyond Their Years: Mitchell is this trope to the extreme.
  • Your Size May Vary: See Depending on the Artist above.
  • Youthful Freckles: Mitchell has these.


Lillian, in all her HD glory
Voiced by: Amelia Shoichet Stoll
Lillian is a minor character who makes her debut in "The Grandest Canyon". She is Mindy's girly friend. Lillian is a sweet, innocent girl, if slightly airheaded at times.
  • A Day in the Limelight: "Fact Or Fiction?" gives her the biggest role in an episode thus far.
  • Agent Mulder: Like Mindy, she believes in witches and ghosts and such. She even believes that clouds are made of cotton candy in "Fact Or Fiction?".
  • Ascended Extra: Lillian gets bigger roles and more appearances starting in season 2, along with other characters like Mitchell and Dr. Skelley. This is likely because of their popularity in the fandom.
  • Asian Airhead: Downplayed. She appears to be Asian, but is slightly ditzy at times such as not knowing what perspective is, telling Mindy what her "surprise" birthday present was, and easily believes that Halloween is magical. Not to mention the whole "clouds are made of cotton candy" debacle in "Fact Or Fiction?".
  • The Bus Came Back: She finally returns in "Mindy Turns Five", where she gets some much-needed development, and hangs out with the rest of Mindy's friends. She is also finally seen in the beautiful HD animation that Giant Wheel Productions, Studio Vysnc, and Enchanting Studio Limited currently do for the show, as opposed to the ugly, low-budget animation she was first seen in, in early season 1. It is just glorious seeing her in HD.
  • The Cameo: Lillian makes cameos in "Kid-Kart Derby", "Mindy's Meteorite Stand", "Racing on Sunshine", and "Mars Rock for Mom".
  • Cannot Keep a Secret: Lillian is terrible at keeping secrets, as she told Mindy what her birthday present was in "Mindy Turns Five".
  • Cheerful Child: Well, obviously.
  • The Cutie: Sweet, innocent, lovable. Yep, definitely fits the bill.
  • The Ditz: Lillian isn't exactly the sharpest tool in the shed. She didn't know what perspective was, she blabbed out what her surprise present was to Mindy, easily believes that Halloween is magical, thinks that Sunspot wears a costume, and believed that clouds are made of cotton candy.
  • Dressed to Plunder: In "That's One Gigantic Pumpkin, Jet Propulsion!", she dresses up as a Pirate Girl, and her outfit is a pretty typical pirate outfit that includes the following tropes.
  • Expy: Appearance-wise, she resembles Sonya Lee from Little People.
  • Foil:
    • So far, she seems to be one to Mitchell, being everything that he isn't. While he's an intelligent arsehole, she's a ditzy sweetheart. Adding to this is the fact that he's an Agent Scully while she's an Agent Mulder.
    • She's also a foil to Sydney. Both are the very kind-hearted and imaginative girls in their respective groups. But while Sydney is smarter and, while imaginative, knows how to separate fiction from fact, Lillian is more air headed and easily believes in the supernatural.
  • Girls Love Stuffed Animals: Lillian owns a teddy-bear named Fluffy Bear.
  • Girly Girl: And how! Lillian wears a big pink bow in her hair and a dress, and loves to play with dolls, and have tea parties.
  • Girly Girl with a Tomboy Streak: She usually acts feminine, but lets her tomboyish side show when she dresses up as a pirate in "That's One Gigantic Pumpkin, Jet Propulsion!".
  • Graceful Ladies Like Purple: Part of her dress is purple. She's graceful in the sense that she's a Girly Girl who excels at gymnastics.
  • Hidden Depths: She finally gets some in "Mindy Turns Five". She is revealed to be bad at keeping secrets, and she also does gymnastics. She can even do a flawless somersault.
  • Hair Decorations: Lillian wears a big pink bow in her hair.
  • Kindhearted Simpleton: Airheaded she may be, but she's still very gentle and polite.
  • The McCoy: Fits this role in the Freudian Trio with Mindy and Mitchell. Lillian is more emotional and kind than both of them.
  • Nice Girl: Lillian is friendly and polite to pretty much everyone. She is by far one of the nicest characters on the show, rivaling Jet, his parents, Sydney, and Bergs.
  • Nice, Mean, and In-Between: She's the Nice to Mitchell's Mean and Mindy's In-Between. Lillian is kind-hearted and loving, and the most innocent of the trio.
  • Only One Name: Her last name is unknown.
  • Pink Means Feminine: Wears a pink bow in her hair, and she is by far the most feminine character on the show.
  • Pirate Girl: Lillian dresses up as one in "That's One Gigantic Pumpkin, Jet Propulsion!".
  • Put on a Bus: After "Mindy's Meteorite Stand", she disappeared for a while with no explanation. She returned in season 2, though.
  • Red Oni, Blue Oni:
    • She and Mindy are the Blue Onis to Mitchell's Red Oni, as they both get less angry than he does.
    • They are also the Red Onis to Mitchell's Blue Oni, as those two are very excitable while Mitchell is calmer.
  • Savvy Guy, Energetic Girl: She and Mindy are the Energetic Girls to Mitchell's Savvy Guy, as they're both energetic and easily convinced while he's more skeptical.
  • Shout-Out: Lillian is based off of a character from one of the shorts that Craig Bartlett made for Sesame Street, called "Lillian, Big Sister". She has the name of the big sister from the short, but the appearance of the little sister, which causes fans to believe that she has an unnamed older sister who wears yellow clothing.
  • Smart Jerk and Nice Moron: The Nice Moron to Mitchell's Smart Jerk. Mitchell is quite smart for a kid his age, and he's also very blunt and snarky, with a high-and-mighty attitude at times. Lillian, on the other hand, is ditzy and forgetful, but makes up for it with her politeness and sweetness.
  • Token Minority: Lillian appears to be an Asian.
  • Tomboy and Girly Girl: The girly girl to Mindy's tomboy.
  • You Gotta Have Blue Hair: Strangely enough, Lillian has blue-purple hair.

    Dr. Rafferty 

Dr. Rafferty
Voiced by: Keegan Connor Tracy
Dr. Rafferty is Sean's scientist mother, who works at the DSA. Her assistant is Dr. Bergs.
  • Adorkable: Especially in the episode "My Fair Jet":
    Dr. Rafferty: Uhhh, we're standing in the rain....!
  • Affectionate Gesture to the Head: She gives one to Sean in "Face on the Fritz".
  • Affectionate Nickname: Sean calls her "Dr. Mom" as of the episode "Constellation Prize".
    • A few of the other children have referred to her as "Dr. Sean's Mom".
  • All of the Other Reindeer: Implied in "Visit to Mom's Office". When Jet tells Dr. Rafferty that he is an alien from Bortron 7, Dr. Rafferty assumes that he feels like an alien, and she mentions that she felt like an alien when she was a kid.
  • Amazingly Embarrassing Parents: In "Project Pluto", she unintentionally embarrasses Sean by mentioning that when he was four, he insisted on carrying a little purple hippo plush around.
  • Blonde, Brunette, Redhead: The Redhead to Bergs' Blonde and Skelley/Peterson's Brunette (her hair is a reddish shade of brown).
  • Brainy Brunette: Is an accomplished scientist, and has reddish-brown hair.
  • The Cameo: Made one in "Every Day is Earth Day".
  • Foil: To Dr. Bergs. While Dr. Bergs is a Butt-Monkey, Dr. Rafferty is more competent and serious.
  • Friendly Tickle Torture: In "I Feel The Earth Move", she tickles Sean's belly.
  • Good Parents: Dr. Rafferty is an excellent mother to Sean.
  • Hidden Depths:
    • "Freebird" reveals that she likes to study birds.
    • "Mars Rock For Mom" reveals that she likes to collect rocks.
  • Hollywood Nerd: Dr. Rafferty is a scientist, but is incredibly beautiful. So much so, that Jet had a crush on her (but it went away in later episodes).
  • The Mentor: She is the closest thing the show has to an actual teacher, along with Face 9000.
  • Nervous Wreck: She can be pretty nervous when under pressure. Examples would be in "My Fair Jet", where she is anxious about the DSA Open House not going well, and in "Astronaut Ellen Ochoa", where she, along with her co-workers, is nervous about Ellen Ochoa's visit to the DSA. It's possible that Sean gets his Nervous Wreck tendencies from her.
  • Orange/Blue Contrast: Her blue shirt contrasts with Bergs' orange shirt.
  • Pink Means Feminine: Dr. Rafferty has pink glasses and earrings.
  • Positive Discrimination: Dr. Rafferty is an accomplished scientist, smarter than her coworker, and is rarely the butt of anyone's jokes.
  • Smart People Wear Glasses: Dr. Rafferty is an accomplished scientist, and wears glasses.
  • The Spock: Dr. Rafferty serves this role in the Freudian Trio with Skelley and Bergs. While Rafferty is more open and friendly than most examples of the trope, she's the most intellectual of three and even though she's a Nervous Wreck at times, at least she has more self-composure than Bergs.
  • Stacy's Mom: Jet had a crush on her for a few episodes (most prominent in "Visit to Mom's Office" and "Asteroid Patrol"), though this was eventually phased out.
  • True Blue Femininity: She wears a blue shirt.
  • Unnamed Parent: Her first name is unknown.
  • Women Are Wiser: Dr. Rafferty is shown several times to be smarter than her coworker, Bergs. In fact, she is the smartest human character on the show. (The smartest character in the entire show is Face 9000).
  • You Remind Me of X: In "Visit to Mom's Office", she says that Jet reminds her of herself when she was a kid. For context, Jet ended up telling her that he's an alien from another planet, but Dr. Rafferty interprets this as him pretending to be one, and says that she felt like an alien when she was kid, too. Dr. Rafferty also admires how Jet's got it all worked out.
  • Youthful Freckles: Dr. Rafferty appears to be relatively young, and she has freckles just like her son.

     Dr. Bergs 

Dr. Bergs
Voiced by: Brian Drummond
Dr. Bergs is Dr. Rafferty's co-worker.
  • Agony of the Feet: In "Astronaut Ellen Ochoa", he hurts his foot.
  • Big Eater: Bergs loves to eat pies and other sorts of pastries.
  • Blonde, Brunette, Redhead: The Blonde to Skelley/Peterson's Brunette and Rafferty's Redhead.
  • Butt-Monkey: Can be this at times. Especially prominent in season 2, where Sunspot keeps stealing his watch.
  • The Cameo: Made one in "Every Day is Earth Day".
  • Comical Overreacting: In "Astronaut Ellen Ochoa", when he has borderline meltdown when his Ellen Ochoa coffee cup gets shattered.
  • Drama Queen: As stated above, he is this in "Astronaut Ellen Ochoa".
  • Dumb Blonde: Not exactly dumb, per se. He's smart, but not so much compared to Dr. Rafferty.
  • Fanboy: Dr. Bergs seems to be one to Ellen Ochoa. He even has a coffee mug with her face on it.
  • Foil: Bergs is a bit of a bumbling Big Eater, which contrasts with Dr. Rafferty, who is much more competent than he is.
  • Hair of Gold, Heart of Gold: Bergs has blonde hair, and is one of the nicest characters on the show.
  • Hidden Depths:
    • It is revealed in the episode "Lone Star", that his great-great grandpappy was an early astronomer and actually built the Deep Space Array.
    • In "Eye in the Sky" he reveals he was a Space Scout when he was young.
  • The McCoy: He fills this role in the Freudian Trio with Rafferty and Skelley. He is the most emotional of the trio and the most prone to panicking under pressure.
  • Meaningful Name: "Berg" is a topographical name for someone who lived on a hill or mountain. This fits him because his ancestor, Lone Star, built Boxwood Terrace's first observatory on a hill.
  • The Mentor: Along with Dr. Rafferty and Face 9000, he is the closest thing the show has to an actual teacher.
  • Must Have Caffeine:
    • Bergs loves coffee. He is almost never seen without a cup of coffee in his hand.
    • In "Astronaut Ellen Ochoa", Bergs' already-established caffeine addiction is taken Up to Eleven, where he drinks lots of coffee to compensate for his nervousness and is devastated when his Ellen Ochoa coffee mug breaks. As such, Dr. Skelley advises him to drink decaf instead.
  • Nervous Wreck: In "Astronaut Ellen Ochoa", while all the DSA scientists are nervous about Ellen's visit, Dr. Bergs certainly takes the cake. He tries to drink coffee to compensate for it but is only made more hyper. This isn't helped when his Ellen mug gets shattered.
  • Orange/Blue Contrast: Bergs wears an orange Hawaiian shirt, which contrasts with his blue jeans and Dr. Rafferty's blue shirt.
  • Serious Business: He clearly treats coffee as such.
    Dr. Skelley: What about your rule about staying calm in any emergency?
  • Smart People Wear Glasses: Bergs is an accomplished scientist, and he wears glasses.
     Mr. Peterson 

Mr. Peterson
Mr. Peterson is Mitchell's somewhat snooty father. He is the judge/referee of contests around the neighborhood, such as the Boxwood Terrace Kids' Baking Contest, and the annual Kid-Kart Derby. "Mindy's Weather Report" reveals that he is the (self-appointed) safety officer of Boxwood Terrace. He is also a huge soccer fan. Wise advice: do not make him mad.
  • Accent Interest: In the episode "Kid-Kart Derby", Mr. Peterson takes note of Jet's apparent Midwest accent. Jet says that Bortron is in the middle of their spiral arm of the galaxy, so midwest was accurate. Luckily, Mr. Peterson avoids finding out that Jet is an alien by assuming that Bortron is somewhere in Iowa.
  • All Work vs. All Play: The All Work to Carrot's All Play, as hinted at in "Earth Camping".
  • Berserk Button:
    • Sean kicking his soccer ball into his yard as implied in "Ice Moon Enceladus". Also, the TV satellite not working as revealed in "What's a Satellite?".
    • Also, do not under any circumstances, force him to go shopping. He loathes shopping.
  • Beware the Nice Ones:
    • He's generally friendly (although he has a slight rivalry with Carrot), but when he gets mad, he's scary. For example, his extreme rage at the beginning of "What's a Satellite?".
    • This trope is also in effect in "Back to Bortron 7", where Mitchell wakes him up at 2 AM to try and expose the Propulsions, and then he gets told off for it.
  • Blonde, Brunette, Redhead: The Brunette, along with Dr. Skelley, to Bergs' Blonde and Dr. Rafferty's Redhead.
  • Brainy Brunet: If him being a DSA scientist means anything.
  • Disproportionate Retribution: In "Ice Moon Enceladus", the kids set up a sno-cone stand in order to raise money to send astronauts to Mars. Now, an important characteristic of Sean's is that he wants to grow up to be the leader of the first human mission to Mars. Mr. Peterson comes by the kids' sno-cone stand, and Mindy informs him that buying a sno-cone will help send Sean to Mars. Mr. Peterson recognizes Sean as the kid who keeps kicking his soccer ball into his yard, and then Mr. Peterson proceeds to purchase several. In short, Mr. Peterson wants to send Sean to Mars just for kicking his soccer ball into his yard.
  • The Dog Bites Back: In "Back to Bortron 7". After Mitchell tries (and fails) to reveal the Propulsions' alien identities, Mr. Peterson chews him out for failing to provide evidence, and for waking him up and dragging him outside at 2:00 AM. This event happened after several episodes in which he never scolded Mitchell and always did everything for him.
  • The Everyman: Of the DSA scientists, he is the most average and plain. Though that's not saying much considering some of his more comical antics.
  • Extreme Doormat: He is this trope to his son Mitchell, catering to his every whim, especially in "Mindy's Weather Report". By "Back to Bortron 7", however, he grew a spine and stood up to his insolent son when the latter woke up him up at 2 AM to try and expose the Propulsions.
  • Foil: To Carrot. Both are somewhat goofy fathers. Carrot embraces his silliness and is usually a nice dad, but isn't above being stern to Jet (like in "Chore Day"). Mr. Peterson, on the other hand, treats the most minor of things as Serious Business (such as mini-golf and the communications satellite not working) and almost always lets Mitchell get away with stuff.
  • Friendly Enemy: To Carrot. They are usually at odds with each other (especially in "Earth Camping"), but they sometimes can be good friends.
  • Hidden Depths: In "Holidays in Boxwood Terrace" he is revealed to have directed the annual Christmas pageant for 3 years and was exhausted. When Jet pitches his pageant idea to him, he gladly hands over the directorial reins to Jet.
  • Informed Attribute: He is the town's self-appointed safety officer, yet we never see him acting as such.
  • Large Ham: He has a tendency to speak very bombastically.
  • Last-Name Basis: He refers to everyone by their last names, including his colleagues, the children, and his own son.
  • Misery Builds Character: In "Mindy's Weather Report", Mr. Peterson tried to tell Mitchell that carrying heavy sandbags will help build character. Mitchell protests that his character is already big enough, so Mr. Peterson ends up carrying his sandbags for him.
  • Non-Standard Character Design: As opposed to the huge, shiny, semi-circle eyes that most of the characters have, Mr. Peterson has tiny eyes. It makes him stick out like a sore thumb amongst the cast.
  • One Of These Is Not Like The Others: Unlike his science colleagues, he is not a doctor and is not referred to as such.
  • Only Sane Man: Played with. He seems to think he's this amongst the DSA scientists, but when compared to the others, he's the only insane one due to him being a Large Ham who takes everything way too seriously.
  • The Pirates Who Don't Do Anything: In "Mindy's Weather Report", he claims that he's the self-appointed safety officer of the neighborhood, and even in that episode, we don't really see him acting as such. He's also a scientist, even though we never see him working at the DSA.
  • Pushover Parents: He constantly puts up with Mitchell's crap and caters to his every whim. However, in "Back to Bortron 7" he ends up standing up to him for once.
  • Serious Business: He treats mini-golf as such as shown in "Mini-Golf at the DSA". The kids even lampshade it.
  • Spell My Name with an "S": Sources often spell his surname as Petersen.
  • Straight Man: Whenever he is paired with Carrot, he's the more logical of the two.
  • Unnamed Parent: His first name is unknown.
     Dr. Amy Skelley 

Dr. Amy Skelley
Voiced by: Brenda Crichlow
Dr. Skelley is Sydney's mother. She is a robotics engineer at the Deep Space Array. She makes her debut in the episode "Commander Mom". She also appears in the TV movie Back to Bortron 7, albeit a brief appearance at the end. In "Commander Mom", she rebuilds Jet's robot clone, Jet 2.
  • Adorkable: She shares her daughter's love of Commander Cressida.
  • All There in the Script: Her first name is Amy; this was revealed in "Commander Mom"'s official PBS description, but not in the show itself. She wasn't even credited as Dr. Amy Skelley.
  • Ascended Extra: She was only ever mentioned by Sydney during some episodes of season 1, and appears in the very last of said season, but season 2 gives her a lot more screentime and focus.
  • Blonde, Brunette, Redhead: The Brunette along with Peterson, to Bergs' Blonde and Rafferty's Redhead.
  • Brainy Brunette: Dr. Skelley has brown hair and is a very smart scientist.
  • The Cameo: Made one in "Every Day is Earth Day".
  • Facial Profiling: She is an African-American with thick lips.
  • Fangirl: She was a fan of Commander Cressida. She even owns the first issue of the comics as shown in "Commander Cressida Begins".
  • Gadgeteer Genius: She knows all about robotics, engineering, and technology. She also holds a strong belief that robots are the future, and teaches the kids about the types of jobs robots have, like helping out at a grocery store, rescuing trapped animals during a flood, collecting comet dust samples, and exploring volcanoes on Mars. She even rebuilds Jet's robot clone, Jet 2, at the end of the episode and makes him into a Do-Anything Robot. Now that is awesome.
  • Good Parents: A smart, loving, and patient mother to Sydney.
  • Hidden Depths:
    • "Eye in the Sky" reveals that she was a Space Scout when she was young.
    • "That's One Gigantic Pumpkin, Jet Propulsion!" reveals that she has a knack for gardening.
  • The Kirk: She serves this role in the Freudian Trio with Bergs and Rafferty. While she, like them two, was nervous about Ellen Ochoa's visit in "Astronaut Ellen Ochoa", she was easily the most level-headed of them all and served as the middle point between the two.
  • The Leader: Dr. Skelley is the leader of the DSA scientist group consisting of herself, Dr. Rafferty, Dr. Bergs, and (if the plot calls for it) Mr. Peterson, since she is the calmest and level-headed out of all of them, and also has a clear plan of what to do next.
  • The Mentor: She is this to the kids, in regards to robotics at least.
  • One Steve Limit: Amy is also the name of the scientist that hosts the show's interstitials.
  • Spotlight-Stealing Squad: In season 2, she gets a lot of screen-time, usually being the go-to scientist if the kids have a question, making Dr. Rafferty and Dr. Bergs' appearances in this season scarce. However, this isn't as bad as other examples, and at least she doesn't hog the spotlight as much as Mindy.
  • Tomboyish Ponytail: Usually wears her hair like this, fitting her due to her being a robotics engineer.
  • True Blue Femininity: She wears a blue shirt.

    The Unseen Parents 

The Unseen Parents

There are seven parents that have not been seen in the series: Sean's father, Sydney's father, Mitchell's mother, Mindy's parents, and Lillian's parents. It is unknown if they will appear in future episodes.
  • Ambiguously Absent Parent: All of them.
  • Brainy Brunette: Implied with Sean's father. He has brunette hair, and he's in the science fieldnote .
  • The Cameo: Sean's father appeared in a photograph in "Sean's Year In Space".
  • Generation Xerox: As seen in the aforementioned photograph, Sean looks like a younger version of his father.
  • The Ghost/The Unseen: You think?
  • Overprotective Mom: At least implied with Mindy's mom, who never let her go anywhere past Jet's yard until "Mindy Turns Five".
  • Papa Wolf: Downplayed with Sean's father, but in "Night of a Bazillion Stars", he insisted Sean should bring moonblock to a sleepover.
  • The Voice: Some of them have been heard, but not seen. Mitchell's mother was heard talking to him "Mindy's Moon Bounce House". Mindy's mother can be heard calling to her in several episodes. Lillian's mom told her it was time to go to gymnastics class in "Mindy Turns Five".

    Ellen Ochoa 

Ellen Ochoa
Voiced by: Kathleen Barr
Ellen Ochoa is a real life person who is an astronaut, and the director of the Johnson Space Center. She comes to visit Boxwood Terrace in "Astronaut Ellen Ochoa" to review an engineering project.
  • 100% Adoration Rating: Ellen seems to have a reputation amongst the Boxwood Terrace population. All the DSA scientists are eager to impress, the kids taking a liking to her immediately, and even Floyd the squirrel is nice to her.
  • Brainy Brunette: She has brown hair, and she's also an accomplished scientist.
  • The Cameo: She makes a cameo during the research montage in "Moon Face".
  • Drink Order: In her episode, Ellen Ochoa drinks some lemonade from the kids' lemonade stand. This gives us some insight into her character by telling us that even though she's a major scientist, she's really just a normal person and is also One of the Kids.
  • Nice Girl: Ellen is friendly, compassionate, and likes to play with the kids.
  • Not Quite Starring: Ellen doesn't voice herself. Instead, she is voiced by Kathleen Barr.
  • One of the Kids: In her episode, Ellen hangs out with Jet, Sean, Sydney, and Mindy, and genuinely enjoys it. She even ends up playing with them.
  • Special Guest: Ellen Ochoa, in "Astronaut Ellen Ochoa", even though she doesn't star as herself.
  • True Blue Femininity: She wears a blue jacket.
  • You Remind Me of X: In "Astronaut Ellen Ochoa", Ellen says that the kids remind her of herself, when she was a kid.

Example of: