Perplexahedron (Episode)

Perplexahedron is the fifteen episode of Ben 10: Ultimate Alien.

Plot
Ben, Kevin and Gwen race Aggregor through a mysterious artificial planetoid designed to destroy anyone who enters it.

Characters

 * Ben Tennyson
 * Gwen Tennyson
 * Kevin Levin
 * Azmuth
 * Charmcaster

Villains

 * Aggregor

Aliens used

 * Swampfire
 * Ultimate Swampfire
 * NRG
 * Water Hazard