Mr. Young

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

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.

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.

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.

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

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.

A student takes credit for writing Adam's love letter to Echo and Adam must prove that the student is lying before Echo falls for the wrong guy.

Ivy invites Echo to a slumber party at the Young house; Adam must now stop Echo from discovering a shrine that exposes his true feelings for her.

Echo gets sick on Valentine's Day, so Adam shrinks down to fight the cold.

Adam tutors Ivy in exchange for tickets to a music festival.

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

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

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.

Arthur returns and makes Adam & Echo babysit Arthur's kids. Meanwhile, Derby and Ivy decide to dress up as robots so they can make friends with Arthur. ARTHUR returns to Finnegan with his new robot family and asks Adam to babysit his "grandkids." Adam agrees and tries to impress Echo with his parenting skills, but soon realizes that dealing with kids is not as easy as it looks.