The graboi, also called the dirt dragon, is a fictional invertebrate species that is the primary antagonist of the Tremors series. The creature made its debut in the 1990 film Tremors, and reappeared in its sequels Tremors 2: Aftershocks (1996), Tremors 3: Back to Perfection (2001), and Tremors 4: The Legend Begins (2004). It has also appeared in the series' spinoff Tremors: The Series (2003).