When Malcolm and Dandy discover one of the school buses is haunted, the two ghost hunters must steer the ghost away from his mission of revenge.

When Grandma Eunice gives Malcolm a strange bottle that she "won" during the 1939 World's Fair, it turns out to contain the ectoplasm of the performer that she tricked--so if Malcolm wants to keep his bottle he is going to have to figure out how to evict this stubborn ghost.

When Malcolm and Dandy set out to get a picture of a ghostly pirate ship, they find themselves reeled in by the pirates--and they have to agree to dig up the captain's buried treasure or they will never be allowed to leave.

When Malcolm spots an advertisement for Mystic Mack's Grow A Ghost, he jumps at the chance to have a butler ghost to do his chores and homework, and spy on his sister--but soon things start to go wrong, and this ghost proves difficult to get rid of.

When the local museum hosts the exhibit for the mummy of Egyptian king, Tuturtikum, Malcolm and Dandy want to be the first in line. But they soon learn there is more to the mummy than just a wad of rotting rags. They've both become victims of the Tuturtikum curse! It seems the only way to zap the curse is to zap the ghost of Tuturtikum. But can the curse be lifted or will they be jinxed for life?

At the county fair, ten-year-olds Malcolm and Dandy face a real ghost in the Screaming Mansion, while at home, Malcolm's sister Cocoa's attempt to become Fair Queen has the family in turmoil.

Ten-year-olds Malcolm and Dandy think their ghost-hunting days are over when they start fifth grade with the toughest teacher in their school, but Malcolm's photographs for the yearbook reveal that the school is haunted.

While his great-grandmother seeks her deceased husband, ten-year-old Malcolm and his best friend Dandy have no trouble finding a ghost on which to test Malcolm's latest gadget--a ghost zapper.