Nine million years in the past on Cybertron, Onslaught is assigned as leader of the Elite Guard Combaticon unit, designed to seek out and stop the leadership of the Decepticon forces.
The Elite Guard Alpha Team and Strike Team did battle against a horde of ferrovorous bugs in one of Cybertron's city-states. Magnum then ordered the Strike Team to escort the Alpha Team to Space Port Bravo for their next mission. The Strike Team then reported to Magnum and Sentinel Major, who introduced them to the new Elite Guard Special-Ops Team, also called the Combaticons.
While on patrol Onslaught told Metalhawk the story of how his Elite Guard team captured Thunderwing. Metalhawk then told Onslaught about how his team captured Blue Bacchus. The teams of Elite Guardsmen then came across a Decepticon who was separated from his group. Brawl was able to get the location of a Decepticon base from the captive before he went offline. The Guard teams around the base and were able to kill Shadowcaster, the base's leader. Metalhawk's team reported to Magnum, but the Combaticons stayed to investigate, Onslaught thinking their victory was too easy. They were captured by Decepticons.
He later became a Decepticon.
Metalhawk and his Strike Team were searching for Decepticons when they ran into a crazy "empty" who ranted about the coming of the "brute". They received a distress signal from Sentinel Major ordering all Elite Guard units to return base. When Metalhawk's team arrived at the base Ricochet told them of a Decepticon attack. Among the attackers are the Combaticions, but when Sentinel Major orders them to surrender, they combine into Bruticus and crush Sentinel Major.
When most of the members of the Autobot Elite Guard confronted Bruticus they were nearly wiped out, with Bruticus killing most of the Guard. Dion was able to blind Bruticus, forcing it to separate into the Combaticons, but the Combaticons finished off most of the remaining Guard, including Metalhawk, who was killed by Onslaught. This left only Dion alive, buried in the rubble, and Thunderclash's team, which was off planet at the time.
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