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