The graboid is a fictional species of sandworm that acts as the primary antagonist of the Tremors film series.
As Suzanne Ferriss and Mallory Young explain, the "destruction of 'graboids', as they are quickly dubbed, becomes the central tension of the film". The creature made its debut in the 1990 film Tremors (although the name "graboid" was only mentioned briefly), and reappeared in its three sequels and the Tremors: The Series television series.
The graboid is based on the Mongolian death worm, a worm-like creature that attacks animals, and possibly humans. Within the film world, it is store owner Walter Chang (Victor Wong) who names them. The only other person in the first film to use the phrase "graboid" is Val McKee (Kevin Bacon). In the second movie Earl Bassett (Fred Ward) recalls the name "graboid".
According to UGO.com, "graboids are to the desert what sharks are to the ocean".
Read more about Graboid: Physiology, Behavior, Shrieker, Ass-blaster, Life Cycle, Origins, Film Appearances, Other Appearances, Collectible Replica