Grindor

"Objectives will win a battle, but it is sheer ruthlessness that will win a war."

- Grindor

Grindor is one of Megatron's most loyal Decepticons from the Transformers franchise, acting as a genius tactician and heavy weapons specialist. Even for a thirty foot tall robot, Grindor is considered extremely dangerous and physically strong, appearing in Transformers: Revenge of the Fallen as a minor antagonist but having a more important role in the game based on the film.

A large controversy once erupted on whether not Grindor is Blackout, another Decepticon, or not. This is because they both have no personalities in the films and look almost physically identical. However, the games prove that they are in fact two completely different bots.

Transformers: Revenge of the Fallen
Grindor makes his first appearance in the middle of the film when, in helicopter form, soars over to human Sam Witwicky's car, that also contains his roommate and girlfriend. Picking up the vehicle and flying it over to a factory containing Starscream and a just revived Megatron, Grindor takes part in a large fire fight when the Autobots arrive before Megatron can interrogate Sam to find the location of the Sun Harvester, a powerful machine that the mysterious Fallen seeks. Grindor is viciously murdered by Optimus Prime later on in a large fight in the forest, as Prime stuck a pair of hooks in the Decepticon's face before pulling and ripping it clean in half.

Games
NOTE: The games are so much more different than the movie that it is considered a different canon

Decepticon campaign
Grindor serves the Decepticons the same way Ironhide serves the Autobots, the reckless heavy weapons expert. Though Grindor may be hot headed, he is a genius when it comes to battle and uses this to fight through Shanghai, Cario, and a West Coast United States town. After overseeing the Decepticons' "secret" mission to find the Allspark shard in Shanghai, Grindor was imprisoned at the docks only for Sideways to come save him. He then captured Sam Witwicky where Megatron (who was recently resurrected thanks to the shard) successfully interrogated him and got the location of the Sun Harvester, leading to a victory for the tyrannical Decepticons.