In order to make a better first impression on his crush Echo, Adam uses a time machine to travel back to the past to meet her for the first time all over again. After returning to the present he realizes his plan has backfired and he has to time travel back again to repair his relationship with Echo. However, the time travel mishaps multiply and spiral out of control and soon Adam’s meddling in the past has him scrambling to keep from being permanently stuck there.Eventually by the end Adam decides to not change the past and goes back to the present. There Echo tells Adam that she likes him and they start dating. They then kiss. They decide to keep it a secret from everyone else.

Adam uses a time machine to go back in time so he can make a better first impression on Echo.

Dang is called back to Vietnam to take over for Master Ki as guardian of his village. The gang heads to Vietnam to try and convince Dang to come back to Finnegan for graduation. While there, Adam discovers an ancient scroll that points to the mythical fountain of youth, which if found, could make Master Ki young again, releasing Dang from his duties. But to find the fountain, Adam must go up against Echo who is trying to preserve the leaf monkey habitat.

In order to make a better first impression on Echo, Adam uses a time machine to travel back to his very first day as a science teacher.

The school loses power and the students try to live without technology when they accept a dare from Principal Tater.

A Hollywood writer comes to Finnegan with the intention of making a TV show about Adam. But he is distracted by Echo, Derby, and Ivy, who all think they have better ideas for TV shows, starring themselves.

Adam invents an invisibility suit and uses it to spy on Echo. Meanwhile, Echo tries to impress a boy when she has to work on project with him.

Cyclops Foods buys Finnegan High after it goes broke and tests new products on the students.

The morning after Halloween, the gang tries to remember what they did during their candy-fueled haze the night before

With Adam as a judge, the students try to make a school song.So when all the songs turn out bad everyone does it together.

Echo gets "nurse" on her aptitude test, but when she decides to disbelieve it, Adam goes to great lengths to try to convince her that it is her ultimate profession; he becomes an alligator wrestler.

Adam can't get peace and quiet so he buys his own apartment. Thing go wrong when everyone piles in for their own reason. So now, with the help of his mom, they try to get out of the lease. Meanwhile, Tater enlists that Dang help in fooling his new girlfriend Gwen that he's a billionaire living in a mansion. He ends up telling her the truth thinking that she'll like him better but she doesn't and she leaves. Adam ends up selling Tater his apartment.

Adam makes a drink that will make him more confident to ask Echo out, but it ends up wrong when he turns into a monster. And even worse is that whenever he talks or thinks about Echo being cute he turns into the monster. Now he must stay away from Echo to prevent from turning into the monster. But in the end, Echo accidentally drinks the potion and now when she thinks about Adam being cute she turns into a monster.

While taking Ivy on a tour of Great Northern University, Adam and his old professor tell Ivy about Adam's first day on campus.

When Derby almost gives away the secret that Adam and Echo are dating, Adam plots to erase Derby's memory. However, Adam gets Preston Pickles to advertise and use Derby to volunteer the Memory-Erase machine but he uses Echo and erases her memory that she is in love with Adam!

After a prank gone wrong Derby accidentally knocks Santa out of his sleigh on Christmas Eve, causing him to lose his memory. So Adam, Derby, Echo, Ivy and Slab delivered the presents to the world. When they come back (everybody except Derby), they find out that Santa only pretended to lose his memory, and claimed he was lazy and he himself was on the naughty list. This show is mostly Derby's dream.

After Slab threatens Derby for tattling on him to Principal Tater, Derby fears retaliation and asks Tater for protection. Tater offers Derby a chance to pose as an exchange student from Britain, Simon. As Derby masquerades as Simon, Tater must convince Slab that Derby has actually moved away.

Adam accidentally gets Santa Claus's elves fired and must work to get them rehired, or feel their pint-sized wrath.

Mr. Kidd's students like him a lot and think he's fun even though he does the same thing Adam does. Adam tries to change the Memory-Eraser to make it bring back Echo's memory, then Mr. Kid finds out but promises not to tell anyone or to get together with Echo. Slab and Ivy have to do a book report on George Orwell's 1984. They borrow Mr. Tater tape of the movie and when they see it they find out that Adam's mom and Tater used to date and they kissed. Ivy states that she never knew her father. Adam and Ivy's hair consistently falls out, which may mean that their father is Tater. Mr. Kid uses the reversed Memory-Eraser on Echo and they start dating. Shortly after he uses it on everyone and they forget that Adam ever existed. At the end Echo remembers Adam when they kiss. Then he restores everyone’s memory by kissing them, Mr. Kidd gets fired.

A TV news program comes to interview Adam about being the world's youngest high school teacher. To ensure the interview goes smoothly, Tater has dumped Echo, Derby, and Slab in a fake version of Finnegan High.

Derby dates a girl and suddenly realizes that she is related to Mr. Pickles.

Adam Young, a fourteen-year-old genius, starts work as a high school science teacher. When the school bully, Jordan "Slab" Slabinski, threatens to beat him up and steals Adam's master key and wreaks havoc throughout the school. Now Adam must get creative in order to resolve the conflict and outwit the big oaf, or his first day on the job could be his last.

Adam holds an overnight astronomy class in the quad, but finds himself competing for his students' attention with principal Tater, who treats it like a camping trip.Adam tries to trick the class into camping with him. Meanwille Ivy plays a horsing game with the janitor

Adam tries to get Derby off of a computer game called Pixel City. Derby is spending all his time on the computer, playing "Pixel City," as his virtual alter-ego, Antoine Bolognese. Set on convincing Derby to rejoin the real world, Adam enters the game to track him down. But it won't be easy, since Derby has digitally recreated the entire Finnegan gang to serve and protect him.

Time is accelerated after an experiment went wrong; Adam and Derby age.