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