A fake horse and a hidden microphone - PEK is using all their talents to get back to the school after being expelled. It's more difficult than they expect, and Nicolai is still in control of the school.
PEK has a new plan of how to get back to school: Making reverse pranks. To do so they decide that they have to mount a microphone in the girls changing room, and Jonathan has to go undercover as a girl.
In order for the class to go to the amusement park, Bob has to complete his cycling test, there's just one problem: Bob doesn't know how to ride a bike. PEK decides to help him - using a dummy and a remote control.
The class has to spend the day collecting waste, but Nicolai is excused because of two broken arms. When PEK realize they are not really broken, they initiate a plan to expose Nicolai in front of the class.
A rat is on the loose at school. Stephanie wants it killed while Nora wants to catch it and release it back in nature. When Stephanie calls for help from the bathroom, PEK is ready to assist.
It's time for the class photo. Nicolai tease Casper for always doing the dab on the photos, so PEK decides to try to help him get the perfect white smile.
When a wolf is on the loose at the school, Lorenzo being a scout, is in charge of catching it. Knowing that Lorenzo is the worst scout ever, PEK initiate a plan, to make him look like a real hero.
A blood stain on Nicolai's expensive jacket, makes PEK initiate a plan to make him think that it's himself who have stained the jacket.
PEK wants to help Nora get the 8000 kroner that she owes Nicolai for the jacket. With the school being sugar free, Mads suggest they go undercover and sell over priced candy.
Casper has been challenged by his evil cousin Troels to do a YouTube battle. PEK knows he will need help to win, so they set a plan in motion. Jonathan struggle to determine between left and right.
PEK plan a heist at the principals office to get the file on Nicolai. Malinka knows that they are up to something, and use her knowledge to convince Mads and Jonathan to do a sleepover at the school.
Nicolai is bragging about his skills on the basketball court. When Stephanie challenge him to prove it, PEK comes up with a plan to win Nicolai's vote.
Mads and Jonathan are back at school. Everything is not back to normal - it's medieval day at school, and everyone except Mads, agree to pull a prank on Nicolai.
After a fight between Jonathan and Mads, Jonathan, as Joanna, joins the girls secret hate club. When Mads overhears the girls talk about baking soda, vinegar and acid, he's afraid that they are going to blow up Nicolai.
With Jonathan out of the picture, the class has to rely on Lorenzo saving the class' honor in the yearly penalty kick competition. Mads and Nicolai has a plan involving a strong magnet and some iron bars.
To make Nicolai a hero in the eyes of Malinka, Mads has to drive a car towards her, and Nicolai have to rescue her. It's yet another PEK plan that is about to fail.
Trylle-Troels is back to get revenge. He locks Casper and Malinka together, and swallow the key, so now it's up to Mads, Jonathan and Nicolai to come up with a plan to make Trylle-Troels throw up the key.
It's news week at school, and Stephanie lacks a good story. PEK decides to help her make the front page story.
Bob is missing from school. Everyone fears that he has been kidnapped, after the reveal that he was the richest kid in Denmark. PEK initiate a search party using Stephanie's dog.
When Mads, Jonathan and Nicolai arrive at the school, something is wrong. A photo of Nicolai's tail has been shared, revealing his secret. To make matters worse, Mads by mistake reveals that PEK has kept en eye on everyone.
It's a riot at school, with everyone destroying the classroom. When Mads learns about Nicolai's plan for a revenge, he has to make everyone work together, to ensure that Nicolai will still have a chance to stay in the class.