Who ever heard of only four Dinobots?
You only need to look at the officially released concept art for 'Fall of Cybertron' to know Sludge was going to be included in the game. Then what did High Moon do? They ensured he'd never see action in the single-player campaign, and have not included him in the Dino Destructor Pack for multiplayer. But hopefully we can change that!
Sludge has already had a bad run, originally classified as a 'brontosaurus' (a dinosaur proven never to have existed), and only ever having one official toy released. Let his bad luck end, and let him stomp wild in the fields of multiplayer combat.
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