The name or term Grimlock refers to more than one character or idea. For a list of other meanings, see Grimlock (disambiguation).

Grimlock isn't much for subtlety. Well, he does like to sneak up on the panicked Decepticons that are desperately fleeing the attacks of his aerial partner Swoop, but soon as they get in range of tooth and claw, he becomes a storm of violence, ripping into them mercilessly. Even though he is equipped with some heavy built-in firepower, he'd much rather take the up-close and personal approach to battle, especially bringing out the "big guns" by combining with Swoop to form the monstrous Mega-Dinobot.



During the Unicron Singularity crisis, Grimlock served aboard the Autobot flagship Iron Hope. He was called into action during a Decepticon attack on the ship, and battled Predacon alongside Swoop. Force of Habit



  • Grimlock & Swoop (Mega, 2005)
Grimlock transforms into a robotic Tyrannosaurus rex. He can also form the upper body of the combined robot Mega-Dinobot. He was available only in a Mega-class multi-pack with Swoop.


  • This set was not "mech-designed" or engineered by Takara employees, a rarity for normal-series Transformers toys.
  • Grimlock's online bio at the then-Energon-themed Hasbro Transformers website described him as being "armed to the nines", despite a total absence of weapons and (due to his small fist holes) the inability even to use the Energon weapons available in the line.

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