Harlan Band
Played by: Walter Jones
The Hot Shot, All-American Earthling, de facto leader of the kids. He is skilled at gymnastics and martial arts.
Associated Tropes:
- Actor Allusion: In "All You Can Eaty," he refers to the bridge as the "command center" (the only time anyone calls it that) — um, wrong show, Walter!
- Ace Pilot
- All There in the Manual: Back when there was an official website, his profile said that he hailed from the island of Los Angeles.
- Badass Normal: As the only bog-standard human among the kids, he's also the only one without any "powers", though his martial arts prowess helps make up for it.
- Belligerent Sexual Tension: His interactions with Catalina and later Suzee usually come off as this.
- Bullying a Dragon: Loves to torment Radu, who comes from a super strong species that could easily turn him into paste. Fortunately for him, Radu is too much of a Nice Guy to ever actually do so.
- Fantastic Racism: Against Radu, since his father was killed in the war against the Andromedans. He eventually grows out of this.
- Hot-Blooded: "Harlan Band leaps before he looks."
- Humans are Leaders: Immediately assumes this position among his alien classmates without consulting them first, though none of them seems to object really. In the episode where he and Radu swap species (long story), Radu is the one who immediately assumes command, and again, no one really objects.
- Jerk with a Heart of Gold: He can be an overconfident hotshot and harsh with Radu, but he's ultimately a good guy.
- The Leader: In his own mind, and the other kids do usually reluctantly treat him as their unofficial leader. Sometimes he lives up to the concept.
- Leeroy Jenkins: He leaves the plans to Catalina or Suzee. He'd rather jump in.
- Power Incontinence: In "Both Sides Now", he switches species with Radu, gaining Andromedan strength and hearing. He becomes a nervous wreck, because he can hear everything and finds it hard to touch antyhing without breaking it.
- Small Name, Big Ego: "Harlan Band thinks he knows it all."
- The Team Normal: Again, the only human child on The Team.
Catalina
Played by: Jewel Staite
An Insufferable Genius with rainbow hair from Titan, Saturn's largest moon. Has the ability to produce supersonic screams. She has a friend named Suzee, who exists in another dimension. The other crew members think she doesn't exist and think she is just an "imaginary friend," at least at first.
Associated Tropes:
- Cloudcuckoolander: "Catalina is talking to the wall."Catalina: She's invisible!
- Deadpan Snarker
- Insufferable Genius
- Put on a Bus: She's sent off to Suzee's dimension at the end of Season 1.
- The Smart Girl
- Super-Scream
- Teen Genius
- Tsundere: Type B, towards Harlan.
- Wrench Wench
Radu
Played by: Kristian Ayre
A young man from Andromeda who possesses Super-Strength (while being, in a reversion of the associated trope, short, slight, and not in the least bit imposing or aggressive) and super hearing. Because of their abilities, Andromedans were enslaved by an evil alien race called the Spung, the show's version of Star Trek's Klingons. Radu faces prejudice from Harlan early in the series, due to the fact that Harlan's father was killed by Andromedans during a war.
Associated Tropes:
- Beware the Nice Ones: Generally very kind, shy, and gentle, but he can rip you apart if you get him angry enough.
- The Big Guy
- Interspecies Romance / Star-Crossed Lovers: With Elmira, though it never gets to get farther than a kiss.
- The Lancer
- Mr. Fanservice: Sweet and shy despite his Proud Warrior Race, and with enough guilt and self-effacing tendencies to make him a massive woobie. The episode where he turns into a human is very popular.
- Nice Guy: Very nice.Harlan: Did you know that when you enter a room, the hair on the back of my neck stands up?Radu: Yes. I hear it.Harlan: That's gotta bug you right?Radu: Well, um, I'm not thrilled about it, but...
- Pint-Sized Powerhouse: Though he's not a midget, just shorter than you'd expect (the actor is only 5'5", to boot). Word of God is that the Andromedans have extremely dense molecular structures, which is why they're so strong, but also makes them short.
- Star-Crossed Lovers: With Elmira, which is awkward because her race used to keep his race as slaves. He also gets Ship Tease moments with Suzee in season two.
- Super-Senses: His hearing, thanks to spiral-shaped ears.
- Super-Strength: "Radu's really super strong."
Bova
Played by: Rahi Azizi
He hails from Uranus, and has an antenna which creates electricity and a high metabolism. Really hates it when people make jokes about his home planet. Perpetually depressed, but in a Played for Laughs way.
Associated Tropes:
- Deadpan Snarker: If there's a sardonic comment to make on a situation, he will be the one making it.Harlan: I'm tired of running from the Spung! This time they're going to know they've been in a fight!Bova: Oh, yeah, they'll be scraping us off their windshields saying, "Some fight, huh?"
- The Eeyore: "Bova acts likes nothing's funny."
- Kid-Appeal Character
- Lightning Can Do Anything
- Odd Friendship: With Rosie. Tips over into Ship Tease occasionally (like when she mistakenly assumes he's giving her a shoulder rub at one point).
- Personality Powers: He's cloudy and creates lightning.
- Planet of Hats: Uranians are a pretty pessimistic bunch, both from being so far from the sun and from people making fun of their planet's name.
- Shock and Awe
Rosie Ianni
Played by: Paige Christina
Cheerful young girl from Mercury who is hairless and has hot pink skin. She can create heat and always has a "sunny" attitude about everything.
Associated Tropes:
- Beware the Nice Ones: Even more so than Radu. She's the sweetest, nicest, cheeriest little thing you will ever meet, but she does come from a species that can scorch anything just with a touch...
- Blessed with Suck: In one of the show's promos, Rosie notes that her optimism is mainly because she doesn't have much of a choice. If she even so much as thinks about getting upset, her body overheats.
- The Cutie
- Cheerful Child: "Rosie's cheery, bright, and sunny."
- Genki Girl
- Playing with Fire
- Meaningful Name: "Rosie" ties into the reddish-pink colour of roses, complimenting her pink skin, or a play on the term "rosy" meaning cheerful and optimistic.
- The Medic: Even by way of Heal It With Fire occasionally.
- My Blood Runs Hot
- Nice Girl
- Odd Friendship: With Bova.
- Personality Powers: She's sunny and creates heat/fire.
- Pink Is Feminine: Aside from her skin, her fire is pink too.
- Planet of Hats: All Mercurians are sunny and optimistic, with a huge smile constantly plastered on their faces. Rosie is downright placid compared to her parents.
- The Pollyanna
Thelma
Played by: Anik Matern
The resident robot and ship's avatar. She's a little screwed up, thanks to Harlan stepping on and cracking her jewel. It's not clear how much of her personality was like that before the jewel cracking, though.
Associated Tropes:
- A.I. Is a Crapshoot: Though she's not evil, just... nuts. Very very nuts.
- Cloudcuckoolander
- Eccentric A.I.: Constructed to be a highly-advanced android... but then Harlan accidentally stepped on her Personality Chip when the kids first snuck aboard the Christa. She's been profoundly bizarre ever since.
- Fun with Acronyms: Techno Human EmuLating MAchine.
- Literal Genie: "Android Thelma functions wrong."
- Spaceship Girl
Theresa James "T. J." Davenport
Played by: Cary Lawrence
The kids' teacher at the Academy, who accidentally gets stuck on board the ship after having to go search for them when they sneak out of her class onto the Christa.
Associated Tropes:
- Belligerent Sexual Tension: With Commander Goddard.
- British Stuffiness
- The Comically Serious
- Crouching Moron, Hidden Badass: On the very very rare occasions she avoids fainting or panicking, she can be surprisingly effective.
- Fainting: Near constantly.
- Gender-Blender Name: ..."James"?
- Stern Teacher
- Stiff Upper Lip: She... tries to project this image, but generally fails spectacularly.
- Team Mom: She tries to be this to the kids, but they usually don't buy it.
Commander Seth Goddard
Played by: Paul Boretski
The kids' second teacher, an officer and veteran of the Spung War that was busted in rank after an incident with a space pirate.
Associated Tropes:
- Badass Teacher
- Belligerent Sexual Tension: With Miss Davenport.
- Catchphrase: "Space hates... <x>!"
- Demoted to Extra: Suffers an accident that leaves him in a healing coma for most of the second season as part of Nickelodeon wanting to make the show Younger and Hipper.
- "Metaphor" Is My Middle Name: According to Word of God, his middle name literally is "Danger".
- Reasonable Authority Figure: He's more willing to put up with the kids' antics than Miss Davenport is, and more palatable to them in how he gets them to behave. Probably because he's essentially a rebel himself, and also treats them more like his officers than like kids.
- Reassigned to Antarctica: After the Noodle Incident with said space pirate he was busted in rank and sent to the Academy to teach.
- Team Dad: Succeeds at this better than Miss Davenport does at being Team Mom.
Elmira
Played by: Katie Emme McIninch
A young Spung Oracle girl who runs away from her people to escape their control over their women, and ends up meeting and helping the Christa's crew. Was going to eventually become a main character, but the network kiboshed it and shoved in Suzee instead.
Associated Tropes:
- Cute Monster Girl / Green-Skinned Space Babe
- Defector from Decadence
- Interspecies Romance: With Radu, eventually.
- Mad Scientist's Beautiful Daughter
- My Species Doth Protest Too Much
- Non-Mammalian Mammaries: She's a lizard woman with curly hair and breasts. Don't ask too many questions.
- Rebellious Princess
- Star-Crossed Lovers: With Radu, which is awkward because her people used to keep his people as slaves.
- Waif Prophet
Warlord Shank
Played by: George Takei
A Spung commander and space pirate, who first encounters the Christa while trying to retrieve the escaped Elmira, and eventually develops into one of the series' major villains.
Associated Tropes:
- Actor Allusion: When Harlan informs him that the hull of the Christa is made from a material that, if the ship is destroyed, will destroy Shank's own ship from the resulting explosion, Shank laughs off the "obvious bluff". He would know; he was there when the guy who first thought it up came up with it in the first place.
- Big Bad
- But for Me, It Was Tuesday: Averted as Shank implies he's very much not like this. When he faces off against Goddard he makes sure he catches his rank and full name (and even double checks it with him) because Shank wants to have all the facts right when he adds Goddard to the list of people he's killed.
- Large Ham: Not surprising, considering who plays him.
- Third-Person Person
Suzee
Played by: Rebecca Herbst
Catalina's "imaginary" friend, who turns out to really be an alien girl living in a different dimension. If you took all of Catalina's personality traits and set them on HIGH, you'd get Suzee.
Associated Tropes:
- The Ace
- All There in the Manual: The long-defunct official website listed her homeworld as "Yensid".
- Astral Projection: She is able to project her mind into other people's bodies temporarily.
- Imaginary Friend: Subverted. Everybody else thinks she's this, but at the end of Season 1 she turns out to be real.
- Insufferable Genius: Her whole species are geniuses.
- Real After All: She turns out to be real at the end of Season 1, and takes Catalina's place aboard the Christa in Season 2.
- Replacement Flat Character: For Catalina.
- The Smart Girl: "Suzee's smarter then a million books."
- Suspiciously Similar Substitute: A dual example. She was meant to replace Catalina, who departed because Jewel Staite moved to a different show, but also replaced Elmira, who was intended to become a series regular before Nickelodeon executives nixed it. Consequently, she has a lot of Catalina's character tropes, but has an approximation of Elmira's mental abilities and is teased as a love interest for Radu.
- Teen Genius
- Wrench Wench