A relationship gradually develops between a savvy New York street girl and a good-hearted cab driver, but other matters keep getting in their way, including financial problems and a murder.

After solving their last mystery at Spooky Island, the Mystery Inc. gang is back in Coolsville, where they are being honored with their very own exhibit at the Coolsonian Criminology Museum. However, when a masked villain steals costumes of classic monsters on display and brings them to life, the gang must come out of retirement to solve the case.

Peter, an orphaned boy, is adopted by Gramp Frye after his parents are killed in Europe while doing war relief work. The boy feels safe with his new caretaker, but when he is taunted for being an orphan, he gets demoralized. The next day Peter wakes up with green hair. Embarrassed and further ridiculed, Peter seeks solace in a nearby forest. To his surprise, he finds other orphans in the woods, who encourage him to spread news of the injustices of war.

A young black pianist becomes embroiled in the lives of an upper-class white family set among the racial tensions, infidelity, violence, and other nostalgic events in early 1900s New York City.

Childhood chums Rocky Sullivan and Jerry Connelly grow up on opposite sides of the fence: Rocky matures into a prominent gangster, while Jerry becomes a priest, tending to the needs of his old tenement neighborhood.

Two musicians witness a mob hit and struggle to find a way out of the city before they are found by the gangsters. Their only opportunity is to join an all-girl band as they leave on a tour. To make their getaway they must first disguise themselves as women, then keep their identities secret and deal with the problems this brings - such as an attractive bandmate and a very determined suitor.