The Tremors franchise is a monster movie series centering on the vicious attacks of subterranean worm-like creatures known as Graboids. It began in 1990 with the successful release of Tremors, which spawned six direct-to-video sequels. In addition to the film series, Tremors: The Series, a television series that premiered on Syfy, was produced, only to be cancelled after 13 episodes. A pilot for another series, for which original star Kevin Bacon was to return, was produced in 2018, but the series did not move forward. Michael Gross is the only cast member to have appeared in all films, as well as the TV series.