Me Grimlock destroy Decepticons!

Grimlock is a member of the powerful Dinobots, who have sided with the Autobots in the war. Grimlock transforms into a mechanical T-Rex, and can be seen in both trailers for the game. He was captured by Shockwave, but after being taunted by Starscream, Grimlock is able to break free of his binds. Shockwave is also responsible for his odd alternate mode, after conducting experiments on him.

"I swear to God, when I get out of here, I'm going to kill you all!"