Grimlock is the name of several fictional robot characters in the Transformers universes. He is usually portrayed as a tough leader who turns into a dinosaur. In 2007, USA Today polled people as to which Transformer they want to appear in the next Transformers film; Grimlock came in tied for second with Devastator.
Read more about Grimlock: Transformers: Generation 1, Transformers: Robots in Disguise, Transformers: Energon, Transformers, Transformers Animated, Transformers: Timelines, Transformers: Prime