...Nor Iron Bars a Cage

Nor Iron Bars a Cage is the seventeenth episode of Ben 10: Ultimate Alien.

Plot
Having absorbed Ben's aliens in order to defeat Aggregor, Kevin has reverted to his previous insane personality. Now, Ben and Gwen are forced to travel to a planet used solely as a prison in an attempt to bring an end to Kevin's terrorizing rampage in order to help him come to his senses and return to his original human self.

Characters

 * Kevin Levin (main character of the episode)
 * Ben Tennyson
 * Gwen Tennyson

Aliens Used

 * Goop (fusionfall confirmed)              FF_FreeWeeklyCode_GoopSet.png

Villains

 * Ultimate Kevin

Trivia

 * The name of the episode likely comes from the poem by Richard Lovelace with a well known verse being "stone walls do not make a prison, nor iron bars a cage".
 * Confirmed by Dwayne McDuffie, we will learn how Kevin escaped the Null Void in this episode.
 * The prison planet Incarcecon is revisited since the events of Ben 10: Secret of The Omnitrix.