Sludge

A member of  an elite grope of warriors called the lightning strike coalition, Sludge is a part grope of specialised commandos in battle against the Decepticons, doing what a battalion worth of Autobots can do in one.

Most bots and cons think that Sludge is just another brawler in the Lightning strike Coalition, and Sludge doesn’t clear that misconception up, however it’s a surprise to most bots that he’s the medic of the grope, and some doesn’t want to believe it.

He can also combine with his teammates to form Volcanicus

History:

Sludge was cold-constructed during middle Nominus times and became a commando, he was put together under Grimlock and with some other soldiers to form the Lightning strike Coalition, he joined Optimus Autobots during the great war with Grimlock and his friends.

During the attack on the Decepticon Combiners development facility in Tarn, She along with his teammates were transformed and combined to create Volcanicus by Firecracker, who fired the enigma on the grope[Operation: Combination]

He participated in a battle with Grimlock and his team and helped them try and retrieve a Cybertronian Data pod as well as treating Grimlock from his injuries and assumingly participate in the next battle 1 or 2 days later.[Spotlight Grimlock]

He also later got the Ability with most of his teammates to combine Into Volcanicus. He was one of many bots to be on the Ark and got stuck on earth, when he was awoken he took on a beast mode. He also assumingly took part in the raid of the Decepticon factory[Transformer vengeance 1 of 4]

Notes:

He's based on the G1 character of the same name

He turns into an Apatosaurus