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.

Knowing that Steve lacks having an talent for a tealent show, Marty provides him with a singing voice which makes him popular with one girl in particular. Meanwhile, Marty helps an elderly woman through a transitional phase after she sees him at one of the singing shows.

With a little help from Marty, Steve finds himself making the westling team. But when Marty isn't about it is up to Steve to get himself out of another one of Marty's mistakes.

Marty is re-assigned to rock star Sammy Noah after he does such a wonderful job by enlisting historical figures to help Steve.

Sabrina tracks her runaway cat, Salem, who has used his magic ""time ball"" to blast everyone in time back to 1979. Meanwhile, Judy is bemoaning the lack of a man in her life, but when Marty turns the family dog into the loyal and loving ""Bob,"" she gets more than she bark-ained for on the disco dance floor; and Marty tries to create his own magic with Sabrina hoping to win her heart even if it takes a thousand years.

Marty gives Steve's science frog the power of speech. Steve then refuses to disect the frog when he befriends it. Making an annoyed teacher and a happy frog.

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.

Steve's dad, Casey, has returned to the family but when Grandpa moves in as well, Steve has to learn a lesson in respect and Marty learns his invisibility isn't limitless.

Steve throws Marty a sixteenth birthday party even though he's dead and Marty insists on inviting kids from school and other dead people like Beethoven, Abraham Lincoln (you get the picture)...

The school's play ""Munity on the Bounty"" is coming up and Steve lands the lead role with the help of Marty. Some of the people around Steve however are getting worried because he is constantly talking to thin air...

Marty calls himself Vlad and dresses up so he can impress the girl, Nia, that he liked before he died. He only hopes that the Head won't find out.