Duel of the Duplicates stars Ben 10 in a battle to protect the Plumber Base. The Plumbers are under attack, and it's up to Ben Tennyson to save the day. But the bad guys are evil versions of Ben's own aliens, so it won't be easy! Use special powers as Feedback, Snare-oh and Bloxx to fight enemies, solve puzzles and find collectibles. Play Duel of the Duplicates, more Ben 10 games and other free online games on Cartoon Network.