The Ultimate Enemy (1)

1 The Transmogrification of Eunice 2 Eye of the Beholder 3 Viktor: The Spoils 4 The Big Story 5 Girl Trouble 6 Revenge of the Swarm 7 The Creature from Beyond 8 Basic Training 9 It's Not Easy Being Gwen 10 Ben 10,000 Returns 11 Moon Struck 12 Prisoner #775 Is Missing 13 The Purge 14 Simian Says 15 Greetings from Techadon 16 The Flame Keeper's Circle 17 Double or Nothing 18 The Perfect Girlfriend 19 The Ultimate Sacrifice 20 The Widening Gyre 21 The Mother of All Vreedles 22 A Knight to Remember 23 Solitary Alignment 24 Inspector #13 25 The Enemy of My Frenemy 26 Couples Retreat 27 Catch a Falling Star 28 The Eggman Cometh 29 Night of the Living Nightmare 30 The Beginning of the End 31 The Ultimate Enemy (1) 32 The Ultimate Enemy (2)