Lee was looking forward to his first year of high school at A. Nigma High. That is, until he was falsely accused of pulling off the biggest prank in high school history and sentenced to one full year of detention. You know what they say - do the crime, do the time. The only problem is Lee is actually innocent. Now, every day, he must escape the heavily fortified detention room, infiltrate a new social clique, and unravel yet another piece of the gigantic, mysterious prank puzzle – all to discover who really pulled off the totally epic stunt he got blamed for.
His popularity has slipped and Cam is now in the cool crowd. Chaz get suspended from the news desk. However, Vice Principal Victoria is attending the party to talk with the grown-up. Lee manages to steal one of Cam's shoes but couldn't make it back to detention, since Barrage knows that he sneaks out of detention, unaware of the air vents. Unexpectedly, Vice Principal Victoria picks him up, spares him for sneaking out of detention and drives him back to detention, she tells Barrage that she let him out so he can help her carry books and tells Lee not to let it happen again. Lee finds out that Cam's shoes fit the shoe print from the rafters, unfortunately for him, Holger and Cam aren't speaking to him again, since they think he cares more about the prank and the mysterious Radcircles rather than them. Cam clams that in the prank Lees bag fell and he put back up on the chair. He also told Lee that he brought a bag like Lees because it looked cool, and when Lee had the same one he gave it to his sister. Lee is still unsure whether Cam was hypnotised during the prank as he acts like a monkey when someone says 'butterscotch' so he might have been hypnotised.
Holger forces Lee to run for president because he thinks it will get even with Lee and Cam. When Lee hears that if he wins he can get out of detention for good, he takes the vote seriously. Biffy helps Lee humiliate Cam as Kimmie helps Cam humiliate Lee, Holger makes everything worse by accidentally making Cam think about tell everyone about Lee's crush on Tina Kwee during the vote. Unaware of his plan, Lee plans to use the word "butterscotch" to hypnotise Cam in front of the school, but will use it if his plan is worse. At the election, Cam tells the school about Lee's crush on Tina (who thinks it's a lie), Lee retaliates and hypnotise Cam. Cam acts like a monkey and climbs onto the rafters as Lee follows, Lee finds out he was hypnotised during the prank. Lee apologizes to Cam about the prank and Cam is eventually elected as class president.
The outcasts were at Lee's 10th birthday party, and it may be the know about Cam being hypnotized. Lee tries to get close to them and learn that they are trying to get a whisker from the red tazelwurm to cure their "curse" (being unpopular to the other students). They discover a pyramid under the cafeteria, which is protected by a large group of blue tazulwurms and are saved by the tazulwurm. Lee discovers the Outcasts were not responsible for the hypnosis of Cam. At home, Lee discovers a photo of his 10th birthday and finds out that Biffy was at the party.
While trying to talk to Biffy about his birthday party, Lee ends up following him with Brandy, Holgar, and Greta, who are having a date, in tow. Lee and Brandy find Biffy at a building whose logo resembles the symbols on the materials used in the prank. Biffy turns out to be visiting his parents, who own the building. Lee has no other choice than to find out what happened to the Amazing Finnwich.
Tina's younger (and for some reason, smarter) sister Ruby turns herself in because she was behind the prank. Lee tries to find out if she is involved in the prank and Tina investigates whether she is involved in the prank or used by Lee (in her words). Cam helps Lee track down the real Radcircle and eventually bumps into the figure, dropping Radcircle's phone in the process. Ruby confesses to Tina and Lee that she wasn't involved in the prank and wanted detention so she can't go to university. Lee is then given Radcircle's phone and detention from Barrage back. Lee charges Radcircle's phone, he can't wait to use it to find out who he is. The episode ends with Lee leaving his room for dinner and Radcircle's phone being fully charged and is locked.
Lee and Cam try to find the Amazing Finnwich at an amusement park. Meanwhile, Holger and Greta witness Biffy and Kimmie on a ride together. Finnwich tells them that he was only fleeing because of a prophecy involving Lee, the "manifestum" who cannot be hypnotized. He eventually deprograms Cam, but when Lee and Cam ask Finnwich why he was talking to Barrage earlier, he disappears. When he gets home, Lee ignores Radcircle's conversation and wants to know if Barrage is working for Radcircles or is Radcircles.
To prepare for the school inspection, Barrage summons the Hazmats to sanitize the school, however, they run loose and sanitize the staff and students as well.Brad, who thinks it's all being filmed for a movie, leads the school witnesses to the library, following Lee's idea. Tina, Cam, Lee and Biffy find out that the Hazmats are robots. They eventually stop the Hazmats and Vice Principal Victoria forces Barrage to deactivate, fix and make the Hazmats 'desanitze' the early victims. Lee feels jealous of Brad kissing Tina and tells Biffy to try harder at cracking Radcircle's phone.
After giving detention to people who have seen the robot Hazmats, including Cam, Tina and Brad, he finds his opportunity to get Brandy to help him school inspector to inspect the school. Their phones are taken custody, including Radcircle's phone, which are taken to be burnt. The schools fails to pass but is given a second chance. Lee eventually retrieves Radcircle's phone and replaces the burnt phones with new ones, given by Vice Principal Victoria from the School Sponsor.
Lee finds out that Barrage is reprogramming the Hazmats, he needs to get a head, fast. He is eventually assisted by the red tazulwurm to find a Hazmat head, sneak in and out to get back to the group. He finds a "Save the Rainforests Dance" poster and a strange machine that plugs into pictures of all the school students. The group find that Barrage doesn't own the Hazmats and the key to hacking Radcircle's phone. The episode ends with Lee preparing to discover the secrets of Radcircles.
Lee leads Victoria to the underground tunnels, to tell her that she is going to be kidnapped by someone. Victoria tells Lee that she used to be a government officer, whose group was eliminated by Barrage, also a government officer. Victoria tells Lee to frame Barrage so that people think he's evil. Meanwhile, the school tries to propose a theme for the school dance, Tina and Brad suggest a "Save the Rainforests" dance, to make the dance a bit romantic, for Tina (whose secretly planning to dance with Lee). Their idea is ultimately chosen by the school due to the prank song, which hypnotises the students. At home, Lee is told by Cam that Holger is going to the dance with Kimmie.
Lee finds that Lynch can track down who's Radcircle and they both go to confront him. While there, Lee gets trapped in a room and Lynch disappears. Radcircles contacts him from a TV in the trap room. Lee escapes and finds lynch's wallet with the address to his home.Lee then starts a search for Lynch. When arriving at Lynch's house, he spots Principle Barrage going into the house using Stealth Mode. Lee sneaks in as well and goes to Lynch's room and hides under the bed. Barrage almost caught him with his eye scanner, but it just missed coming into contact with Lee's skin. Barrage leaves, and Lee crawls out from under the bed. He then notices Lynch's computer, and he finds a video with Radcircles in it. In front of the computer, there was a voice modifier and his billboard is covered by sticky notes which have Knock Knock Jokes written all over it. This indicates that Lynch is Radcircles.
Cam and Brandy are called to Room 113B, which has never been used as a classroom but as the janitor's closet. It turns out that the room has a secret elevator and a Hypnosis system which leads to the underground room where Lee found the strange plug machine which turns out to be the reason the school (except Lee and Biffy) gets hypnotised. They destroy the machine and escape the room, but Biffy is left behind as he confronts a few Hazmats. The school inspector arrives at the room Cam, Brandy and Lee are in for the school inspection. Lee tries to tell the inspector that Barrage is evil but is rejected and is declared the reason for why the school isn't perfect, so he is expelled. Meanwhile, Lynch who has brainwashed everything about him from every person's memory, plans the school dance to set up a trap. But an unsuspecting Tina feels curious.
Lynch who plans the school dance, tries to get Lee back from being expelled, since it wasn't part of his plan. Tina, who reveals that she has fallen in love with Lee, comes to rescue Lee and tells her everything that has happened. They go underground to try stop Barrage but Vice Principal Victoria reveals that she is responsible for the hypnotizing of the school so she can use the strategy to take over the world and even captures Barrage, with the help of the Hazmats. Lee is only chosen as the target because he's immune to the hypnosis, unaware that Biffy is too. Lee and Tina escape, Barrage is beaten by Victoria's soldiers as she starts the dance. Lynch reveals to Lee that he only wanted to prank him so he can play with him, since he's a loner. Lee and Tina go to the dance and stop Victoria, with the help of Biffy, Cam, Brandy and Holger, by getting everyone to throw their phones and break them as they dance. Victoria is taken by a council whom Victoria fails to impress, using the strategy. A member of the council hypnotizes everyone, including Tina, into forgetting everything that happened, except the dance, and congratulates Lee for being helpful to the council before she leaves. The dance continues and Lee manages ask Tina to the dance. The episode ends with a mysterious figure pulling off the prank again.