Onslaught is a Decepticon with the role of Combaticon Leader.  He is one of the five Combaticons that combine to form Bruticus.  Onslaught believes that planning is the most important part of a mission and he prefers it to the actual battle.  Besides forming the head and body of Bruticus, Onslaught also transforms between his robot mode and his vehicle mode.

The Generation 1 Onslaught was available individually in 1986 and was also available in the Bruticus gift set in Japan and Italy during the same year.