...Nor Iron Bars a Cage

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

Plot
To settle an old score, Kevin voluntarily returns to the Null Void prison he once escaped.

Characters

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

Villains
zombozo

Trivia
The first two words of this episode's name is actually a palidrome.

The name of the episode likely comes from the poem by Richard Lovelace wiht a well known verse being "stone walls do not make a prison, nor iron bars a cage", this may also be a reference be Kevin returning to his prison voluntarily.