Ben 10: Ultimate Alien/Episodes

The following is a list of episodes for Ben 10: Ultimate Alien. A total of fifty-two episodes have been ordered so far. Episodes 1 through 10 were intended be season 1 and episodes 11 through 20 were to be season 2 but it was merged into one season due to Cartoon Network's schedule. The Transmogrification of Eunice was intended by the people who made Ben 10: Ultimate Alien to be the start of a third season. However it had been split into more than one season.

Note: Some episodes may not be aired in the order on the DVD and in the order of their production.

Eugene has confirmed that there are 52 episodes total and the remaining episodes are part of season 3 before the start of the New Series. 

Unknown Number

 * Night of the Living Nightmare