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 Star Teens join forces with Ben 10, his cousin Gwen, his other cousin Sunny, and his love interest Julie Yamamoto (and Ship) to battle against Gabba and his gang (along with Charmcaster and Darkstar) at Arco Iris.

Characters

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

Voice Cast

 * Aimee Carrero - Tanya
 * Ashley Johnson - Gwen Tennyson, Sunny Tennyson
 * Brad Garrett - Gabba
 * Cree Summer - Queen Vampira
 * Dee Bradley Baker - Stonetrap
 * Grey Griffin - Sandra
 * Jeff Bennett - Brutus
 * Jennifer Hale - Veronica
 * Kari Wahlgren - Ella, Charmcaster
 * Kate Micucci - Inidra
 * Kimberly Brooks - Sheila
 * Richard Steven Horvitz - Screech
 * Susanne Blakeslee - Bella
 * Tara Strong - Felicia, Eeva
 * Taylor Lautner - Kevin/The White Knight
 * Vyvan Pham - Lisa, 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.