Mort was killed in a fatal collision with a train during a race with his classmate. In the underworld Mort was assigned to frighten others into appreciating life, however neither family nor friends appreciated Mort's return.
* Heightened speed, durability, energy projection as ghost
As a ghost, Mort, composed of ectoplasm, could remove his head, divide into multiple apparitions and otherwise reshape himself. He could become invisible and intangible, fly or levitate in place, generate "electoplasmic shock" of several hundred volts, see others' daydreams, and "enter" a film to interact with its characters. He could apparently create objects out of excess ectoplasm.