: Emperor Milleous and Princess Attea lead an invasion of Earth. Duel of the Duplicates : Features Albedo attempting to regain his Galvan form. Galactic Monsters : Ben and Rook face supernatural-themed alien threats. The Evil Rooters : Explores the "Rooters," a rogue Plumber Black Ops wing. The Mad Nightmare : Ben deals with alternate reality versions of himself. The Time War
If you're looking for the best episodes to rewatch, community discussions often highlight these standout moments: ben 10: omniverse episodes