After Marty accidentally kills himself, he's appointed as a guardian angel to...
Teen Angel
Season 1 Episode 6: I Love Nitzke
To make Aunt Pam like Mr. Nitzke, Marty takes some of Cupid's arrows. However, his poor aim causes Judy, Pam, and Katie to all fall for Mr. Nitzke, making Steve uncomfortable when they all insist on coming to the Halloween dance with him.