Season 2: 2003–2004
In contrast to season one, 22-minute episodes became the norm for season two. There were six episodes with two 11-minute shows, and ten episodes with a full 22-minute show. Also, like episodes 15-16, 18, 19, 20, the theme has an extra sound effect in that same Yokian clip.
|Prod. No.||Title||Summary||Original airdate|
|21||"Sorry, Wrong Era"||Jimmy makes a Time Replay Remote that Hugh uses for the wrong intentions, and accidentally sends Jimmy, Carl, and Sheen back... 200 Million Years!||September 5, 2003|
|22||"The Retroville 9 / Grumpy Young Men"||Jimmy, Carl, Sheen, Cindy and Libby turn into a top-notch baseball team with Jimmy's improved baseball equipment. Absent: Judy/ Jimmy, Carl and Sheen turn themselves into old men to buy an M-rated video game.||October 3, 2003|
|23-24||"Operation: Rescue Jet Fusion"||In a salute to spy films like the James Bond series, Jimmy teams up with his idol, actor and spy Jet Fusion, to save the world yet again from Professor Calamitious.
Note: This one hour episode has a special theme at the beginning.
|October 13, 2003|
|25||"Nightmare in Retroville"||Buffy the Vampire Slayer.||October 29, 2003|
|26||"Monster Hunt / Jimmy for President"||A rumor spreads that a lagoon monster will haunt Retroville, but Jimmy thinks otherwise. Absent: Goddard, Hugh, Judy/ Jimmy runs for class president against Cindy and foreign exchange student Bolby, and Carl is being forced by each of them to vote for them. Absent: Hugh, Judy||November 11, 2003|
|27||"Return of the Nanobots"||The Nanobots escape from Jimmy's lab and wreak havoc.||November 14, 2003|
|28||"Holly Jolly Jimmy"||After Jimmy accidentally knocks out Santa Claus (which he originally didn't believe in, due to science.), he goes out to deliver all of the presents. Note: This is the third of three episodes that does not appear in Netflix.||December 8, 2003|
|29||"Love Potion 976/J"||Jimmy creates a love potion for his friends that makes them fall in love with the first person they see. Jimmy falls for Cindy, Sheen for Libby and Carl for Jimmy's mom!||February 14, 2004|
|30||"Sheen's Brain"||Jimmy increases Sheen's brain to be larger and smarter, but Sheen soon becomes evil with his new mental powers. Absent: Hugh, Goddard||March 8, 2004|
|31-32||"The Jimmy/Timmy Power Hour"||Jimmy Neutron and Timmy Turner cross universes.||May 7, 2004|
|33||"Maternotron Knows Best / Send in the Clones"||Jimmy creates a robot version of his mom. Absent: Cindy, Libby/ Jimmy makes clones of himself to escape from chores, but one mischievous clone ruins everything.||May 9, 2004|
|34||"The Great Egg Heist / The Feud"||Jimmy, Carl, Sheen, Cindy and Libby search for a precious egg in a museum. Absent: Hugh, Judy/ Carl and Jimmy are forced to end their friendship as their parents are fighting against each other. Absent: Cindy, Libby||May 10, 2004|
|35||"Out, Darn Spotlight"||Jimmy joins his school play to spend more time with his crush, Betty Quinlan. Absent: Goddard||May 11, 2004|
|36||"The Junkman Cometh"||Jimmy goes to rescue Brobot and his parents from the Junkman's ship. Absent: Cindy, Libby, Hugh (pictured only), Judy (pictured only)||May 12, 2004|
|37||"Foul Bull / The Science Fair Affair"||Miss Fowl takes her students to a rodeo. Absent: Hugh, Judy/ Jimmy is mad that he is banned from the science fair. Absent: Goddard, Judy||May 13, 2004|
|38||"Men at Work"||Jimmy, Carl and Sheen get jobs at the fast food diner, McSpanky's.||May 26, 2004|
|39||"The Mighty Wheezers / Billion Dollar Boy"||Jimmy, thinking the Wheezer family is too nerdy, gives them super powers. Absent: Cindy, Libby, Goddard/ Jimmy meets Eustace, another boy genius who is a rich showoff.||June 7, 2004|
|40-42||"Win, Lose and Kaboom!"||Jimmy, Carl, Sheen, Cindy, Libby, Goddard, and Bolbi compete in an intergalactic game show in order to stop the show from destroying Earth.
Note: This movie is also known as You Bet Your Life Form.
|July 9, 2004|