Jimmy is excited about the near completion of his new time machine. But his future self tries to tell B.O.B. to stop him from building it, because if his present saw him, the world will collapse.
Then, another future Jimmy visits SpongeBob and orders him to let Jimmy build it. This causes terrible stuff to happen. Then Jimmy sees his 2 futures and a big hole comes to suck up the universe completely. The present Jimmy goes back in time to convince B.O.B. that the time machine should not be invented. But then the Jimmy who originally came back to B.O.B. realizes that the time machine must be invented after B.O.B. explains the irony B.O.B. tells him, "Huh, Ironic, If you hadn't invented the Chronotron, then, you couldn't be able to go back in time to tell yourself not to invent it." & goes back to warn SpongeBob that it must be invented.
After the 2 of them were gone, Timmy throws the time machine into the black hole which causes it to go away. SpongeBob, Timmy and B.O.B. then ask Jimmy to build something that won't destroy the universe like a snow-cone machine.
Jimmy then builds it, and it ends up completely covering the world in snow-cones. SpongeBob then says that Kowalski over did it by calling him a maniac (a quote from Planet of the Apes). But then, Jimmy, B.O.B., and Timmy show up carrying snow-cones as Jimmy says, "Yup. But you have to admit, these snow-cones sure are good." To which SpongeBob replies, "Oh sure. Totally worth it."
- Jimmy Neutron
- SpongeBob SquarePants
- Timmy Turner
- B.O.B. (Benzoate Ostylezene Bicarbonate)
- Sheen Estevez
- Chester McBadbat (no lines)
- Future Jimmy Neutron #1
- Future Jimmy Neutron #2
- SpongeBob, Jimmy, Timmy and B.O.B.'s Headquarters
- Downtown Cartoon World
- Zoo Office
- Sheen's backyard