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