Meego is made temporary babysitter for the Parker kids after his spaceship crashes in their backyard and he waits for repairs to be completed, but quickly finds himself growing attached to the youngsters and questioning his return home.

Meego gets his first paycheque, but still has a lot to learn about money; Maggie interrupts her studies to watch Trip and his friend play street hockey.

Maggie tries to tell her dad that the family nanny is an alien. Meanwhile, Meego goes on a date with the Parkers' next-door neighbor; and Edward helps Alex build a model car for a derby.

When Meego hears that Trip is no longer required to study to pass history now that he's the star of the basketball team, which is coached by the history teacher, Meego gives his own lesson. Meego shrinks the teacher/coach and leaves him guarded by watchdog Barkley, while he substitutes - as King George III. Meanwhile, Dr. Parker and Alex plan a fishing trip.

Be careful what you wish for! Trip learns a valuable lesson after he takes Meego's magic wrist device and uses it to trick a popular girl into believing that he's the boy of her dreams. Trip initially enjoys the attention but changes his mind when his new ""girlfriend"" Brooke begins shadowing him and hanging on his every word. Meanwhile, the alien plays poker with Dr. Parker and some interns.

Maggie finds out that her secret admirer will be arriving incognito at her Halloween party and enlists Meego's aid in unmasking the mystery man, while Meego tends to spooky tasks of his own when he sets out to give Trip a scare.