Looking to prove to Jenny that boy robots are jerks compared to him, Sheldon creates a mechanical suit and dubs himself the "Silver Shell". The plan backfires, however, when Jenny starts falling for Silver Shell.

Jenny volunteers to be a robot toy for an underprivileged tyke, Todd, at Christmas, only to become his unwitting, remote-controlled weapon in an attack on all the holidays. When Jenny becomes public enemy number one, she must prove that the little boy is the true villain before he forces her to attack Santa's workshop and destroy Christmas forever.

Jenny is unwittingly programmed for evil against her will by a spoiled child named Todd Sweeney, who uses her to ruin the holidays for all of Tremorton. When she returns to normal, she discovers that the entire town has turned against her, and nobody believes her pleas of innocence, except for the one person that worships her like a goddess - Sheldon. Todd, however, still intends to use her to ruin the year's biggest holiday—Christmas.

Brad gets a chance to join the Skyway Patrol in hopes that he can help Jenny in her duties. However, he soon finds himself stuck with nothing but paperwork and paper cuts at his new job.

Jenny takes the Silver Shell to the Sadie Hawkins school dance, and Sheldon hopes that he can impress Jenny enough to reveal his identity to her. Everything starts going wrong, however, when Letta and the Space Bikers crash the dance.

Jenny gives in to Tuck's request to be his entry for the hit robot combat competition "Robot Wars", despite finding the event barbaric.

Tired of being stuck under Jenny's shadow, Brad sets out to be his own hero. However, he finds himself in hot water when he runs afoul of the scientist Dr. Locus and his daughter Melody. Locus wants the XJ-9 schematics for reasons yet unknown and when Jenny gets knocked out in battle, Brad has to prove himself.

Due to internal disputes, the Teen Team has broken up. With no place left to go, Misty heads back to Earth to be with Jenny. Teased at school by the Crust cousins for her appearance, Misty convinces Jenny to get back at them through a prank war.

Melody returns to Tremorton, and Brad begins spending more time with her. Is Jenny merely getting jealous, or is Melody more of a dischord than she seems?

Vladimir, Lancer, Mudslinger and the Mad Hammer Bros. form the 'Legion of Evil' to seek their shared vengeance on Jenny.

After almost getting hit by a truck, Tuck becomes hyper-paranoid about everything, until Jenny shows himself in the future, perfectly healthy. Tuck realizes that he's not going to die until he lives a full life, and decides to become a daredevil, seeking fame and glory. Unfortunately for Jenny, this means a lot of stopping what she's doing and saving him from his crazy stunts.