Devastator is a Decepticon from the Transformers: The Movie franchise.
Devastator is the combined form of the Constructicons.
Devastator forms when the Constructicons merge in NYC. He shouts: "PREPARE FOR EXTERMINATION!" and starts searching for Autobots to smash. He is shot at by pesky human jet fighters, which he follows to the top of the Empire State Building. Jetfire spots the behemoth on-top of the huge building, and proceeds to fly up to the top of the skyscraper to engage him. Starscream in-turn tries to destroy Jetfire, but in the ensuing confusion, Devastator accidently swats Starscream. Jetfire lands and clings to Devastator. Devastator eventually shakes him off. Jetfire then uses his sword to slice off the giant's head. Devastator's head-less body then plummets to the ground, with the top half of the Empire State Building coming down on-top of him.
Devastator uses his sheer strength to destroy his enemies, he also has an arm mounted chainsaw.