After eating a 6 month old hamburger, Marty DePolo dies. God's cousin Rod tells him he is going to be the guardian angel of his best friend, Steve. Steve becomes happy that his best friend is back until Marty makes fun of the history teacher, Mr. Nitske. Nitcke tells everyone there's is going by a test the next day, worth 50% of their grade. Everybody gets angry at Steve and Steve gets angry at Marty. Now Marty has to fix everything...
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.
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.
Love is everywhere when Marty mis-fires Cupid's arrows. Steve mum, Aunt Pam and sister Katie are all madly in love with Mr Nitzke, making the school Halloween dance a once in a time time experience.
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.
After Katie loses her tribal feather just before a camp out, Marty plucks on from his wing. It's only when Katie and Steve get to the camp site that they find out the magical power behind it.
Steve and Jordan are spending time together and Marty is reunited with his uncle. While Marty likes to go wherever Steve and Jordan, Steve thinks that three's a crowd.
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 discovers that he can travel through time. He goes back six months to when he ate the old hamburger. But if he didn't eat the hamburger, then he's not an angel, which means he couldn't go back in time, and Steve might actually eat the hamburger, which means . . . what?
Marty helps Casey win a toy, but an athlete thinks that she has got talent and tries her out for a professional baseball team. Grandpa also gets reunited with his dead wife.
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.