Wendigo

A wendigo is a creature out of Algonquin mythology, noted for eating human flesh. A wendigo could possess other humans and turn them cannibal, or a human who ate human flesh could turn into a wendigo.

In October 2007, Chaz Villette and Daphne Worth discussed how various legends, including that of the wendigo, might derive from gammas of preindustrial times. Later, in the DVD extra "Mythology", Daphne Worth and Hafidha Gates had a somewhat similar conversation.