Grimlock is the leader of the Dinobots and one of the strongest Autobots of them all; he could even come to blows with Optimus Prime and Megatron and come out on top. Though aligned with the Autobots, Grimlock is an arrogant 'bot who despises weakness and considers strength to be the only remarkable quality of any being. He does not care much for the humans that the Autobots fight so hard to protect, but one thing he hates more than weakness is when the strong abuse their power. When push comes to shove, Grimlock is indeed an Autobot at heart, but that doesn't mean he plays well with others.
- Superior Strength - Grimlock is one of the strongest Transformers, his sheer brute strength rivalling that of Optimus Prime or Megatron.
- Energo-Sword - Grimlock's signature weapon is a blade that has been charged with an energon power cell, greatly increasing its cutting and blunt-impact force.
- Rocket Launcher - A single-handed projectile weapon that can fire two explosive missiles at once.
- Alt Modes - Grimlock's most well-known alternate form is that of a robotic Tyrannosaurus Rex. In this form, Grimlock can crush most enemies beneath his feet or sweep them away with his tail. His jaws are strong enough to bite through virtually anything and he can also expell flaming plasma from his mouth and reduce most 'bots to molten slag. Before arriving on Earth, Grimlock could transform into a massive Cybertronian battle derrick with reinforced armour and numerous weapons.