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Randy Cunningham is an average high school freshman until he is chosen to become The Ninja. Now he must defend the downtrodden, save his fellow students and become hero to the good people of Norrisville.
When Randy and Howard don't want to admit they are too scared to ride Norrisville's newest waterslide, the Ninja sabotages it and inadvertently releases one of Viceroy's earliest creations.
On the hottest day of the year, Mort Weinerman is finally able to build Randy and Howard's dream pool, thanks to his new promotion he received for building a Ninja that destroys robots for McFist.
Catfish Booray returns to Norrisville as a substitute teacher under control of the Sorcerer.
Randy and Howard put investigative reporter Debbie Kang on the trail of the Ninja's secret identity.
Randy brings the Sorcerer's ball to Julian's magic-themed birthday party and accidentally unleashed its power.
Howard finds some other friends to hang with, causing a jealous Randy to plot a way to drive a wedge between Howard and his new bros.
Randy and Howard are psyched to rock out with pop star Levandar Hart, but they are unaware that Levandar is secretly plotting his revenge for kicked out of their band.
Randy and Howard rescue their favorite animatronic rock star from Whoopee World, only to discover he isn't who he seems to be.
Randy and Howard must take care of a bologna baby for science class, and it mysteriously comes to live.
When Bucky creates a ninja theme song that the Ninja can't stand, Ninja's attempts to shut it down only makes it more popular.
Insulted that Howard doesn't think he's a good liar, Randy goes to extreme lengths to prove to his friend wrong and puts both of them in grave danger.
Worried about losing the "Best Bud" food-tasting competition, Randy uses the Nomicon to cheat and give himself super-senses.
When Randy finds and falls in love with Viceroy's beloved pet Otto, he refuses to give it back and puts Norrisville in danger.
Randy goes undercover to infiltrate Bash's inner circle so he can discover the secret behind McFist's next Ninja-destroying plan.
Randy can't resist tormenting Howard on Halloween by telling the scary story of the terrifying Mudfart and inadvertently brings the maniacal Mudfart back to life.
Randy unleashed the terrifying orange Halloweenja suit from the Nomicon and soon discover that it's a force he can't control.
Wonk laser tag players Randy and Howard decide to use Ninja-ing to level the playing field.
Stuck in a dream-within-a-dream-within-a-dream, Randy must figure out how to escape the loop.
Howard finds out about the true meaning of Hanukkah by saving Greg's Game Hole.
Randy and Howard go to Snow-klahoma. However, Randy leaves the Nomicon at school on purpose to prevent his ninja duties from distracting them.
