Ben 10: Ultimate Alien 2010: 2x12
Prisoner #775 is Missing
The secrets of Area 51 are revealed to Ben Tennyson by Colonel Rosum after Old George infiltrates Area 51. (ChamAilen and Ultimate Wildmutt first appears in this episode).
2 - 1The Transmogrification of Eunice Feb. 04, 2011
2 - 2Eye of the Beholder Feb. 11, 2011
2 - 3Viktor: The Spoils Feb. 18, 2011
2 - 4The Big Story Mar. 04, 2011
2 - 5Girl Trouble Mar. 11, 2011
2 - 6Revenge of the Swarm Mar. 18, 2011
2 - 7The Creature from Beyond Mar. 25, 2011
2 - 8Basic Training Apr. 01, 2011
2 - 9It’s Not Easy Being Gwen Apr. 08, 2011
2 - 10Ben 10,000 Returns Apr. 15, 2011
2 - 11Moon Struck Apr. 22, 2011
2 - 12Prisoner #775 is Missing Apr. 29, 2011
2 - 13The Purge Sep. 16, 2011
2 - 14Simian Says Sep. 23, 2011
2 - 15Greetings From Techadon Sep. 30, 2011
2 - 17Double or Nothing Oct. 14, 2011
2 - 18The Perfect Girlfriend Oct. 21, 2011
2 - 19Ultimate Sacrifice Oct. 28, 2011
2 - 20The Widening Gyre Nov. 04, 2011
2 - 21The Mother of All Vreedles Nov. 18, 2011
2 - 22A Knight to Remember Dec. 02, 2011
2 - 23Solitary Alignment Dec. 09, 2011
2 - 24Inspector #13 Feb. 04, 2012
2 - 25The Enemy of My Frenemy Feb. 11, 2012
2 - 26Couples Retreat Feb. 18, 2012
2 - 27Catch a Falling Star Feb. 25, 2012
2 - 28The Eggman Cometh Mar. 03, 2012
2 - 29Night of the Living Nightmare Mar. 10, 2012
2 - 30The Beginning of the End Mar. 17, 2012
2 - 31The Ultimate Enemy Part 1 Mar. 24, 2012
2 - 32The Ultimate Enemy Part 2 Mar. 31, 2012