The first arc introduces Undertown and Ben's new partner, Rook, while setting up the rivalry with the hunter Khyber. The More Things Change: Part 1 The More Things Change: Part 2 A Jolt from the Past Trouble Helix Have I Got a Deal for You! It Was Them Goodbye and Behold Hot Stretch Of Predators and Prey: Part 1 Of Predators and Prey: Part 2 Arc 2: Malware's Revenge
Episodes: 31–40 The season focuses heavily on the "Drama of the Time War" and Albedo's redemption/corruption arc. ben 10 omniverse ep list
41. And Then There Were None – Vilgax gathers evil alternate Bens to destroy the prime Ben. 42. And Then There Was Ben – No Watch Ben (a Ben without an Omnitrix) must save the multiverse. 43. Cough It Up – Argit and Psyphon fight over "treasure." 44. The Vengers – A superhero team forms in Bellwood to upstage Ben. 45. Cats 'n' Mice – A classic Tom & Jerry style chase with a twist. 46. Bengeance is Mine – A plumber named Bill Gacks (who looks exactly like Vilgax) gains powers. 47. The Color of Monkey – Simian returns. 48. Rook Island – Ben acts like a diva; Rook puts him in his place. 49. It's a Mad, Mad, Mad Ben World: Part 1 – Ben and Rook are stranded in a Mad Max-style dimension ruled by a mad Ben. 50. It's a Mad, Mad, Mad Ben World: Part 2 – They fight Mad Ben's tyrant rule. The first arc introduces Undertown and Ben's new