Heroes Unite

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

Summary
The Space Teens join forces with Ben 10, his cousin Gwen Tennyson, and his romance Julie Yamamoto (and her pet Ship) to help save Bellwood from the alien invasion caused by Vilgax.

Characters

 * Marla Reynolds
 * Nikki
 * Valerie
 * Ursula
 * Jenna
 * Lagom Saylu
 * VIGA
 * Squatchel
 * Neisen
 * Ben Tennyson
 * Gwen Tennyson
 * Julie Yamamoto
 * Ship
 * Vilgax

Voice Cast

 * Ashley Johnson - Gwen Tennyson
 * Frank Welker - Squatchel
 * Grey Griffin - Nikki
 * James Earl Jones - Neisen
 * Kari Wahlgren - Ursula
 * Lacey Chabert - Valerie
 * Laura Bailey - Jenna
 * Matt Smith - VIGA
 * Nolan North - Lagom Saylu
 * Tara Strong - Marla Reynolds
 * Vyvan Pham - Julie Yamamoto, Ship
 * 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.