Heroes Unite

 is the ninth one-hour crossover special in a series of Star Teens: Power Hour specials that features characters from Ben 10: Ultimate Alien.

Summary
The Space Teens join forces with Ben 10, his cousin Gwen, his other cousin Sunny, and his love interest Julie Yamamoto (and Ship) to battle against Charmcaster and Darkstar.

Characters

 * Marla Reynolds
 * Nikki
 * Valerie
 * Ursula
 * Jenna
 * VIGA
 * Squatchel
 * Neisen
 * Ben Tennyson
 * Gwen Tennyson
 * Sunny Tennyson
 * Julie Yamamoto
 * Ship
 * Charmcaster
 * Darkstar

Voice Cast

 * Ashley Johnson - Gwen Tennyson, Sunny Tennyson
 * Dee Bradley Baker - Lagom Saylu
 * Frank Welker - Squatchel
 * Grey Griffin - Nikki
 * James Earl Jones - Neisen
 * Kari Wahlgren - Ursula, Charmcaster
 * Lacey Chabert - Valerie
 * Laura Bailey - Jenna
 * Matt Smith - VIGA
 * Tara Strong - Marla Reynolds
 * Vyvan Pham - Julie Yamamoto, Ship
 * Will Wheaton - Darkstar
 * Yuri Lowenthal - Ben Tennyson

Trivia

 * Kevin E. Levin and Max Tennyson are referenced by Ben and Gwen in this episode, but they don't appear (except for cameos in flashbacks).
 * The aliens Ben transforms into during this episode include Humongosaur, Spidermonkey, and Swampfire.