Repugnus is an Autobot only out of convenience, it seems. Leader of a tribe that inhabits the swamplands south of the Steel Shard Mountains, Repugnus and his people value their freedom very highly. As such, he has a seething hatred of Scourge, the dictator ruler of the Jungle Planet, and fights to keep the dragon's influence out of his land. His hate runs so deep that he has banished his own brother, Undermine, from his swampy home for being associated with Scourge.