A town called Norrisville has been protected by a ninja for 800 years. But what the citizens of Norrisville don't know is that a new ninja is selected every four years. Every ninja starts out as a freshman and when the ninja graduates they pass down the ninja suit. 9th grade teenager, Randy Cunningham, is the next ninja. Randy is bummed, however, that he can't tell anyone. So instead of telling his best friend, Howard, that he's the ninja, he comes to the school for a "meet and greet", not knowing that an evil sorcerer is planning to destroy the ninja.
While walking Theresa Fowler and Debbie Kang home on Halloween night, Randy and Howard try to figure out what is turning everyone in town into zombies.
While walking Theresa Fowler and Debbie Kang home on Halloween night, Randy and Howard try to figure out what is turning everyone in town into zombies.
When a Mexican Death Bear Monster runs amok at school, Randy and Howard realize they should have paid more attention during Spanish class.
Randy's Ninja responsibilities drive a wedge between him and Howard during their rehearsals for Norrisville's Battle of the Bands, leaving Randy to figure out a way to balance his Ninja duties with being Howard's friend.
When a real monster disrupts Norrisville High's annual practice Monster Drill, Randy must retrieve his Ninja mask and the NinjaNomicon in order to save entire school.
Randy and Howard join their school's "Wave Slayer" team but as jet ski waxers. When Randy accidently damages the jet ski belonging to the team captain, Buttermaker, moments before their biggest race, he and Howard must step up and find a way to save the race.
Randy must learn a valuable new lesson about respect and humility when after accidently breaking his sword, he enlists the help of S. Ward Smith to get a custom-made sword. Meanwhile, S. Ward Smith's protégé, Brent, believes he was replaced by Howard and wreaks havoc on the school when he is changed into a monster by the Sorcerer.
When Randy and Howard's video game battle gets out of hand, the Ninja must save the town from a giant robot.
When Randy and Howard are forced to share a lunch table with the outcast group 'Der Monster Klub,' they realize these oddballs are playing a dangerous game that could destroy the whole school.
When Howard and other students get sent to the dreaded Detention Island, Ninja must figure out how to free them. Guest star: Andy Richter as The Disciplinarian.
Randy and Howard get 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 Randy loses the NinjaNomicon, he must save it before hundreds of years of Ninja wisdom is revealed to his enemies.
A feud breaks out when Howard is accepted into a school club and Randy isn't. But when Howard is in danger, the Ninja must put aside his grudge and come to the rescue.
Randy travels to the forest to retrieve sap from a sacred tree in order to restock his Ninja gadgets, but McFist beats him there and snags the tree for his holiday party. Randy poses as a Ninja Santa to get in to the party and winds up defending himself against a robot snowman and his team of elves.
Randy must stop a former Norrisville Ninja-turned-nemesis from recruiting an army intended to destroy the Ninja. David Koechner ("Anchorman") guest stars as Mac Antfee.
When Viceroy creates a Robo-Rhino that makes the gang confront what scares them most, Ninja must learn to turn his own fear into a weapon.
When Randy inadvertently mind-wipes himself and develops amnesia, Howard must fill in as the Ninja until Randy can get his memory back.
Mac Antfee returns to Norrisville as a motivational speaker, only to have Randy reignite his burning desire to destroy the Ninja and take his place.
When Randy helps Hannibal McFist's hippy brother Terry take control of McFist Industries, Whoopee World is turned into a fart-powered nightmare.
In order to score a limo ride with soccer super star Pitch Kickem, 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, Amanda Levay, but little do they know she's actually the Sorcerer's long lost love in disguise.
Coach Green brings back an old Norrisville High tradition, Prank Day! When Bash uses a dangerous Viceroy-created device for pranks, Randy must master his most difficult Ninja skill yet to stop Bash.
When the Ninja lies that his name is Ranginald Bagel, he puts the real Ranginald in danger of McFist's fury.
Randy and Howard follow Theresa Fowler and the rest of their classmates to a cool new club downtown only to discover The Sorceress has returned to seek revenge on the Ninja.
Randy becomes so dependent on the Nomicon's wisdom that he goes to it for advice on everything. To teach him a lesson, the Nomicon traps him inside and puts an alternate consciousness in Randy's body, forcing Randy to try to find a way out of this mess.
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 forbuilding a Ninja that destroys robots for McFist.
Randy and Howard put investigative reporter Debbie Kang on the trail of the Ninja's secret identity.
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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 being kicked out of their band.
When Bucky creates a Ninja theme song that 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 his friend wrong and puts both of them in grave 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.
Wonk laser tag players Randy and Howard decide to use Ninja-ing to even the playing field.
Randy purposely leaves the Nomicon at school so Ninja-ing won't ruin his trip with Howard to Snow-klahoma.
Randy's fake sick day creates more trouble than he bargained for after Howard attempts to get his best friend back to school to avoid eating lunch by himself.
Ninja learns the dangers of selling out when he endorses every business in Norrisville, including McFist Industries.
When Randy and Howard's fake "Chuck-a-Cabra" video gives them instant celebrity, it draws the attention of monster hunter Brawn Brickwall who tries to horn in on their glory by noogie-ing the beast.
Journalist Debbie Kang scores the scoop of the century when she discovers Randy Cunningham is the Ninja!.
Howard's dad Mort thinks Ninja is out to get him, leading to an epic Mort vs. Ninja battle!.
Randy and Howard are forced to go to Saturday school, and Howard discovers that he is a genius on the weekends. Randy uses Howard's new smarts to figure out a way to get them out of going to Saturday school.
6-year-old Randy tries to convince new kid Howard that Norrisville has a Ninja.
Ninja and McFist crash land on the most dangerous place in Norrisville, and they are forced to work side by side if they want any hope of escaping the ruthless bots of Scrap City!.
When Randy and Howard get Principal Slimovitz fired, a computer-based program takes his place and traps the students in a simulated world of forced learning.
When Principal Slimovitz threatens to split Randy and Howard up unless they improve their grades, the boys try to convince him that an apocalyptic prophecy will come true if he does.
A legendary defender of school justice rises from the history books when Slimovitz removes cake fries from the Norrisville High menu.
Randy ninjas out to get McFist tossed from the chilliest island resort on Lake LaRusso, and McFist returns to make things incredibly un-chill for Randy.
Randy and Howard come across a mysterious ancient idol, a Sorcerer's Ball, while on a field trip to Little Norrisville.
Randy discovers that his family is moving because Norrisville has become too dangerous, so he decides that he must defeat Cyborg Julian and make his town a safe place to live.