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