Springfield Elementary is making a time capsule which Bart throws in a sandwich with his snot in it. That night at the Simpsons home, something drops from the air into their yard and sneaks into the house. It turns out to be Bender who doesn't remember why he's there. After some misadventures, Lisa takes Bender to Professor Frink who manages to reboot him where he reveals he's been sent back into the past to kill Homer for inadvertently causing a outbreak of mutated bunnies in the future. The rest of the Planet Express crew arrive in the past and, after some investigation, find out it was due to Bart blowing into the sandwich, Milhouse's lucky rabbit's foot and the toxic waste falling into the capsule that gave rise to the creatures. Both groups return to the future and manage to lure the creatures into Madison Cube Garden and launch it into space. The Simpsons return to the present where Bender shuts himself down so he can return to the future the slow way.
Meanwhile on Omicron Persei 8, the creatures have landed on the planet just as Lrrr and Ndnd are entertaining Kang and Kodos.
This episode has the following tropes.
- The Bait: When he hears someone (Bender) in the basement, Homer ties up Bart and suspends him from the ceiling with a sign that reads "tasty boy" to lure the intruder out.
- Comically Missing the Point: When Bender displays his weapons to kill Homer, Homer is worried about the boxing glove.
- Continuity Nod:
- Bender wears the Pin Pals shirt from Team Homer.
- While Homer is showing Fry, Leela and Bender around, they pass by Pannuci's Pizza where Seymour is still waiting for Fry, complete with a short tune that reprises "I Will Wait For You" .
- Lisa is seen playing the holophonor from Parasites Lost and The Devil's Hands are Idle Playthings, although her's is naturally shaped like a saxophone instead of a clarinet.
- The rabbits are corralled into Madison Cube Garden, site of several events in the Futurama universe.
- Bender shuts himself down for 1,000 years in order to get back to his time, a tactic that is seen in episodes such as "Roswell That Ends Well" and is ultimately reckoned with in Bender's Big Score.
- The Bart mutants use Bart's old catchphrases, get strangled by Homer (along with a repeated, bored version of his old "Why you little..!" catchphrase), and are first herded towards Madison Cube Garden by being told someone is laying a finger on their Butterfinger candy bars.
- Crossover: With Futurama.
- Eaten Alive: Linda van Schoonhoven, the female Futurama Newscaster, gets eaten by one of the Bart monsters moments before it mutates into its gremlin-like form.
- Eskimos Aren't Real: To prove that he's the real Bart instead of a mutated bunny, Homer demands him to tell his birthday. Unfortunately, Homer doesn't believe that February has a twenty-third day.
- Have You Tried Rebooting?: How Prof. Frink restores Bender's memory.
- Hypocritical Humor: Bender deems it unforgivable when the creatures steal office stuff and then it turns out he did it himself.
- Hurl It into the Sun: The mutant creatures are herded into Madison Cube Garden, which is then hurled into space. It ends up on Omicron Persei 8.
- Ignore the Disability: When Leela and Marge meet. Both of them butch it up immediately afterwards.Marge: (thinking) Don't mention the eye. Don't mention the eye.
Leela: (thinking) Don't mention the hair. Don't mention the hair.
Marge: I... am so pleased to meet you!
Leela: Nice to be hair!
- Killer Rabbit: The creatures mutated from Bart's sandwich and Milhouse's rabbit's foot first appear as vicious rabbits. They eventually mutate into green Bart-like demons.
- Mandatory Line: Lampshaded.Zoidberg: Hello, robot! Looks like everyone gets a turn to say something. This concludes my turn.
- My Country Tis of Thee That I Sting: Bart asks if Lisa remembers the time the country was good at something and he says he doesn't.
- My Significance Sense Is Tingling: When Bart sneezes at a sandwich at school, Marge feels it at home.
- New Powers as the Plot Demands: Bender now has cool new Eye Beams.
- Portal to the Past: How Fry, Leela, and Farnsworth show up in Springfield.
- Self-Deprecation: The episode is very aware it's a crossover and does make fun of itself for it.
- The opening subtitle reads "A show out of ideas teams up with a show out of episodes."
- Bart and Lisa note how similar Bender is to Homer, as if someone drew Homer then erased his hair and added an antenna. They conclude that whoever would do that would be a very lazy and unimaginative artist.
- One of the Bart monsters can be seen spraying graffiti that reads "Crossovers are hell".
- Set Right What Once Went Wrong: Bender's initial goal.
- Shared Universe: Apparently, despite the fact that Futurama established it's a separate series from The Simpsons and vice versa. Not only that, but multiple episodes of Futurama reference The Simpsons as a TV series while the vice versa is not true. There have been a few references to Futurama in Simpsons but mostly as cameos.
- Skewed Priorities: When Bender aims his weapons at Homer, he seems most concerned with the Extendo Boxing Glove.
- In the basement, Homer only attacks Bender when he starts drinking his beer. "Stay away from my loved ones!"
- The Slow Path: Since Bender is the time portal, he can't return to the future like the rest of the Planet Express Crew. Instead he shuts himself down for 1,000 years to which Homer puts him into the basement until that time. Since Bender is a robot, he doesn't have to worry about human aging and death like the rest of the crew.
- The Stinger: Kang and Kodos arrive at Lrrr and Ndnd's place for dinner, but are visibly uncomfortable when they begin arguing.
- Time Machine: When Lisa asks if Professor Farnsworth used a time machine to go back in time, he dismisses the notion of a time machine as ludicrous and explains that he turned Bender into a time portal. However, when Professor Frink asks how Bender got back in time, Professor Farnsworth tells her that Bender used a time machine.
- You Already Changed the Past: When the Portal to the Past malfunctions and brings everyone except Maggie and Bender to New New York in the future, Bender takes Maggie to the horse races, since he knows the outcome of every one in this time. For one race, he bets on a horse named "Bender's Bounty", even though it died during the race. It turns out Bender killed Bender's Bounty in frustration because the horse was losing the race.