Trade-Off

Episode Information
Episode Number: 37

US Airdate: 4 December, 2009

Summary
Kevin and Darkstar find a mysterious Artifact that could return them to their previous forms, but do not consider the consequences. Kevin loses his powers and gets turned back to human. Gwen finds out what he did and goes to fight Darkstar and Kevin and Ben come to help but Darkstar absorbs their powers. Kevin can't do anything so he sacrifices his skin and changes back to the way he was before while saving Gwen.

Main Characters

 * Ben Tennyson
 * Gwen Tennyson
 * Kevin Levin
 * Darkstar
 * Forever Knights

Omnitrix Aliens

 * Jetray
 * Big Chill
 * Echo Echo
 * Swampfire

Trivia
The Book Librium may have come from equilibrium meaning balance.