
Steve meets Diane, a girl he falls in love with from Science Club and brings her on a date but he forgot he was meant to baby-sit Katy so Marty brings one of Katy's dolls to life! But Diane thinks Steve is going out with her.
When Marty DePolo dies after eating a six-month-old hamburger, he is chosen to be the guardian angel of his best friend Steve Beauchamp.
Fearing Steve will be rejected when he asks Jessica to go out, Marty pretends to be her when Steve calls. But rather than let him down gently, Marty sets up a date and, in an effort to save his friend from heartache, actually morphs into Jessica, turning a dream date into a nightmare.