Cousins Kate and Mike visit Kate's father, a baseball scout for the Dodgers, in Los Angeles just as a series of suspicious events leads him to think that someone's trying to steal his scouting reports.

When the star of The Grateful Fred receives threatening letters, he calls on Melvin, the superhero in charge of Los Angeles, and his assistant, Candace, to stop the criminal and his henchmen before they destroy Fred's reputation.

When the Los Angeles riots break out in the streets of their neighborhood, a young boy and his mother learn the value of getting along with others no matter what their background or nationality.