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.
The adults head out of town for the weekend and Marvin has his first house party. But when inclement weather causes the family to come home early, Marvin and Teri must get rid of the party evidence before anyone finds out.
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.
Marvin learns about comic books and is amazed when he sees Ben's enormous collection. But when Marvin accidentally damages one of Ben's rarest comics he struggles to come clean knowing it could mean losing his friend.
Marvin is celebrating his favorite holiday, St. Glar Kai Day. However when two FBI agents show up in search of suspect alien activity the Forman's must throw the agents off the case before Marvin's true identity is revealed.