Doug Penhall's estranged brother, Joey, transfers to the Jump Street Unit. After his attempts at making amends with Doug are rejected, he takes an assignment in which he must go deep undercover in a religious cult in order to extract a man's daughter and to prove that the cult is involved in illegal activities.

A star football player is killed when he is hit by a car. McCann goes undercover as his best friend's biology tutor to try to find the killer, but he is unsure of how to proceed once he develops feelings for the girl.