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

Randy and Howard try to get into a cool zone in the bleachers when watching their school play basketball. When one of the triangle-playing band members is fired, The Sorcerer turns him into a ferocious monster.

Howard accidentally tells everyone on a web show that he knows who the ninja is and he is captured by McFist, who demands that he tell him who the ninja is.

Randy takes a trip to the town's volcano, but it's probably not going to be a nice stop-by.

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

A Mexican death bear threatens the school.

After a fight between Randy and Howard, a monster attacks during the school's annual routine "monster drill" where Howard is pretending to be the ninja. Randy must find a way to get to his mask and to apologize to his friend.

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.

Franz Nukid, a strange new exchange student, threatens to destroy the Ninja as well as Randy and Howard's friendship which Hannibal McFist takes advantage of.

When Randy and Howard's video game battle gets out of hand, the Ninja must save the town from a giant robot.

Randy helps students escape from Detention Island.

Bash is thought to be the ninja.

Randy and Howard seek revenge on a French exchange student who stole their Internet video fame - only to cause him to stank out and create a scene they weren't expecting.

When a robot disguised as a rival school's chess team member crushes Norrisville High's record - and their spirit, a mass stanking breaks out.

When Randy loses the NinjaNomicon, he must save it before hundreds of years of Ninja wisdom is revealed to his enemies.

Randy must go with Howard to CluckFest under the threat of Bash Johnson. This won't be easy for Randy since he is afraid of chickens. Meanwhile, Hannibal McFist and Willem Viceroy III unleash a fear-pooping robotic rhinoceros called the Rhinosaurus that forces everyone to confront their worst fear as part of their plot to find the Ninja's greatest fear and take advantage of it.

Randy and Howard must sacrifice everything to prevent the Ninja's ultimate enemy from running amuck.

During Ninja Day, McFist schemes to steal the spotlight by introducing a new hero - himself; the real Ranginald is in danger of McFist's fury.

Mac Antfee (voiced by David Koechner) returns to Norrisville as a motivational speaker, only to have Randy reignite his burning desire to destroy the Ninja and take his place.

Randy misuses his Ninja powers, and the Nomicon refuses to let him Ninja out and rescue Howard from a psychotic Cajun trapper named Catfish Booray.

When Randy helps Hannibal McFist’s hippie brother Terry (voiced by Steve Zahn) take control of McFist Industries, Whoopee World is turned into a fart-powered nightmare.

In order to score a limousine ride with soccer super star Pitch Kickham (voiced by Simon Pegg), the Ninja swipes a pair of shorts to help him win a shoot-out competition. When McFist sends an I.D. Bot to find the shorts, Randy's identity is compromised and Howard must take Randy's place in the competition.

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.