Marvin joins the book club to spend time with his crush, but he hasn’t read the book yet, so he pretends to be sick to catch up. When the book club meeting is moved, Marvin has to sneak out of the house in order to be there.
Mom, Dad, Pop Pop and Henry head out of town for the weekend and Marvin seizes the opportunity to throw his first house party. But when inclement weather causes the family to come home early, Marvin must team up with Teri to get rid of any party evidence before anyone is the wiser.
Marvin & Teri attend the Big Time Rush concert, but unbeknownst to them, BTR has been kidnapped by the Klerg who are on the hunt to find Klutonians. When Teri gets mistaken as a Klutonian Marvin must race to save her.