...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. Ben and Gwen try to halt Kevin's frenzy on the prison planet Incarcicon.

Major events

 * This is the second time that we see Kevin in the Null Void since "Back With a Vengeance".


 * This is the second time that we see the planet Incarcicon from "Ben 10: Secret of The Omnitrix.

Characters

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

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", this may also be a reference be Kevin returning to his prison voluntarily.