Randy Cunningham, a 9th grade kid, becomes a ninja and is to protect Norisville High School.

The Ninja fights a lizard, which copies a sample of his snot. Later Randy and Howard attend a party Bash is throwing, but it's a scheme so McFist can find the ninja by sampling everyone's snot bombs and matching it to the ninja.

Randy and Howard want to win the Science Fair, but will they go too far?

Randy accidentally brings the mad scientist back to life.

Randy and Howard wonder why everyone in town is turning into zombies.

Randy Cunningham looks for the Skunk Pine in order to restock his smoke bombs. When Randy finds the Skunk Pine, it is stolen by Hannibal McFist to use as a Christmas tree party at McFist Industries. Randy also discovers that Howard is at Hannibal McFist's Christmas party when his father's company was bought by McFist Industries. When Randy infiltrates the Christmas party as a Ninja Santa Claus, he ends up fighting a robotic snowman and an army of robotic Christmas Elves in order to restock his smoke bombs.

Bash is thought to be the ninja.

Randy and Howard are eager to ride a new roller coaster but first, the Ninja must stop a Robo-Ape uprising.

Randy, Howard, and all the boys at Norrisville High are entranced by the new girl in school named Amanda Levay. Little do they know that she's the Sorceress (voiced by Jennifer Tilly), the Sorcerer's long lost love in disguise where she has plans to free the Sorcerer.

Coach Green brings back an old Norrisville High tradition, Prank Day.

During "Ninja Day" McFist schemes to steal the spotlight by introducing a new hero - Himself.