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