A raging, reckless robot. The most fearsome and powerful Dinobot ever. Particularly nasty when he's reminded that he now resembles a human. Outer shell equipped with jet pack and atom smashing submachine gun that pierces all forms of armor and eats away enemy fortifications. Inner robot armed with double-barrelled, self-propelled rocket launcher. In dinosaur mode, serrated steel jaws can tear through solid rock. Jet boosters in legs also provide flight capabilities.
Grimlock appeared in the following 29 comic books: