Do you want to compare Onslaught with Mercury? Discover the powers, weakness & weapons of Onslaught and Mercury from Onslaught Biography and Mercury Biography. Find out all about Onslaught and Mercury.# Check out how is Onslaught unique and distinct from Mercury. Discover their love interest, sidekicks, family tree and the movies and games list in which Onslaught and Mercury have appeared. Find out everything about them here!