The Tall Man is a villain from the Phantasm series of films written, directed, photographed, co-produced and edited by Don Coscarelli. The Tall Man was portrayed in the film and its sequels by Angus Scrimm. The character is a supernatural undertaker who turns the dead into zombies, in order to do his bidding and take over the world. He is known for saying the now infamous quote, "Boy!" on several occasions. The Tall Man's henchmen include Sentinels (flying silver balls, referred to as sentinel spheres by fans) that contain a lethal pair of spiked blades and a drill that eviscerates the victim's brain), lurkers and gravers (zombies dressed in nuclear suits armed with chainsaws), dwarves in monk robes (who are made from corpses), and the reanimated dead. He is also on the hunt for Mike Pearson and Reggie and their friends for reasons that are only hinted at in later installments in the series. The Tall Man has been in four Phantasm films and is still alive.

Relatively little is known about him. Once upon a time the Tall Man was a kind-hearted soul named Jebediah Morningside, and he was experimenting with inter-dimensional travel. After perfecting the device that would allow him to travel between worlds, he stepped through the gateway. Upon his return he was no longer Jebediah, but the cold and evil being known to Mike and Reggie as the Tall Man. It can only be speculated that while in a different dimension Jebediah's body was possessed by another intelligence. Ever since then he has carried out his duties of turning the dead into slaves.