The Forman's family dinner night gets canceled and Marvin ends up overindulging in chocolate. However, this results in Marvin getting an alien toothache which brings the family together just when they need it the most.
Teri and Briana plot revenge on a boy who seems to have asked both of them out on a date. Meanwhile, Marvin learns what an 'expiration date' means and that the term doesn't mean the same thing to people as it does to old food.
When Marvin needs some extra money to buy his dream bike, Teri gets him a job working with her at Burger on a Bun, but things get out of hand after Marvin starts taking the job a little too seriously and he ends up firing Teri.
Marvin starts hanging out with the popular kids and has to decide if they really have the best intentions for him while Teri obsesses over the unknown writer of the notebook she found at school.
Marvin and Henry anxiously await the premiere of the newest scary movie, but Liz tells them the movie is off limits. When the boys see it anyway, they learn their lesson when the horrors of the screen start to come to life.
When Teri's only way to go out with her dream guy is a double date, she reluctantly takes Marvin with her. Meanwhile, Bob tries to prepare the family for a possible attack by Klerg agents.
After the family vacation is canceled to protect Marvin's alien identity from being discovered by airport security, Marvin invents a teleportation device which malfunctions and sends the family to another planet.
Marvin has dreams of being famous, or at least winning a trophy, and after learning about his school's Battle of the Bands competition he recruits a class of second graders to help him rock and roll.
Marvin desperately wants a pet and after much asking Liz and Bob give him permission. Marvin hatches a Klootonian egg but when Marvin overfeeds his pet it quickly begins to wreak havoc in the house.
Marvin uses a Calm Palm on Teri when she's over stressed about a fencing competition. Meanwhile, Henry and Pop-Pop want to play hockey in the house, but Bob and Liz want them to follow the house rules.
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.
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 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.
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's Uncle Steve visits the family during Earth Week, and is worried that Marvin loves Earth life more than Klooton, so he threatens to take him back to his "real home".
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.
