Grimlock is a minor character in Transformers: Age of Extinction and Transformers The Last Knight the fourth and fifth installment of the Transformers film series.
He is a gigantic member and leader of the Dinobots who transforms into a T-Rex. Initially aggressive towards the Autobots and their human allies, Grimlock was successfully tamed by Optimus Prime. Befriending the Autobots, Grimlock and the other Dinobots helped them in their fight against the Cemetery Wind, the Decepticons and Quintessa.