Weird or What? is a television series on the Discovery Channel and History (Canada) hosted by William Shatner (except for the U.S. version of Season 1, where his segments were replaced by a fourth story). Each episode contains three separate stories of the bizarre and unexplained. As the show unfolds, it weighs various supernatural and scientific theories that attempt to explain the story, and sometimes features tests conducted as proof of a theory's plausibility. The show features phenomena such as ghosts, aliens, monsters, medical oddities and natural disasters.