It's Sam's first day of middle school and things go from good to bad when he learns he's moving up a grade. However, things get even worse when he discovers his older brother Tyler is in the same homeroom.

Sam and Tyler compete to catch a cricket and find that sneaking around school can quickly lead to chaos. On a school field trip Sam starts hanging out his new 7th grade classmates which strains his friendship with Glen.

Sam is asked to join his homeroom's bike relay team and he's forced to reveal that he doesn't know how to ride a bike. Sam gains a new confidence when he gets his first chest hair and earns the adoration of his class.

Sam impresses his new classmates with an epic birthday party, but his extravagance leads to a bill he can't pay. Hoping to earn a spot on a television talent show, Tyler convinces Carter to revive their old martial arts act.

Sam directs the homeroom's class film and quickly learns balancing everyone's ideas and maintaining his friendships is no easy feat. An argument between Tyler and Sam pushes Tyler to do the unthinkable, join a rival homeroom.

Tyler and Sam try to relive their school glory days by sneaking into their old elementary school fair. Tyler discovers Gigi, Dallas, and Sophia's secret dance club, and does everything he can to prove he's worthy of admission.