Fan Casting Sludge in The Transformers

The Dinobots have a perhaps undeserved reputation for being dimwitted, but Sludge is the genuine article. He makes the other four look like scholars in comparison. As Sludge can't make much of an impression in the mental department, he likes to make his presence known physically. He'll stomp his hefty hide around just so you know he's there. Sludge believes that the strongest should lead, and in his mind, Grimlock is the strongest Autobot. But Sludge genuinely believes in the Autobot cause, so he tolerates Prime. Beyond that, Sludge is actually one of the nicer Dinobots.