Onslaught is the leader of the Combaticons, and the head and torso of the combiner known as Bruticus. He seems to be very annoyed by Starscream's leadership in Transformers: Fall of Cybertron, frequently calling him "idiot" and trying to "salvage an operation that he screwed up from the get-go". He and his Combaticons are arrested after crash landing an Autobot transport and destroying half of the Energon supply in the crash. Onslaught is angry at Starscream, saying "Are you kidding, Starscream? The Autobots would have taken it ALL!"Like most Decepticons, Onslaught is loyal to Megatron and his cause. He seems to just want to work without rules, just to put his talents, and his team, to good use. Megatron usually allows him to do this, but makes it very clear that if he issues an order to Onslaught, he expects it to be followed.
Onslaught is only playable in Fall of Cybertron in an escalation map alongside Quake, Brawl, and Swindle. He is the medic of the four, with his ability being the heal beam. Like the other three, he is required to start the match with a Neutron Assault Rifle and no Heavy Weapon.