The New Adventures of The Wild Thornberrys: Mustang Thunder

Mustang Run is the fourth episode in the second season of The New Adventures of The Wild Thornberrys.

Summary
Eliza and Debbie go horseback riding in Calgary, Alberta, Canada with Debbie's internet boyfriend Jason. However, Jason has a condition that makes him go blind sometimes, and cannot see, so he is different from what Debbie expected him to be. However, his ideas of horseback riding comes in handy when a Brown Bear goes after them. Meanwhile Eliza, Darwin, and Irwin befriend a wild horse named Jock.

Main Cast

 * Lacey Chabert as Eliza Thornberry
 * Tom Kane as Darwin
 * Jason David Frank as Irwin
 * Flea as Donnie
 * Danielle Harris as Debbie Thornberry
 * Tim Curry as Nigel Thornberry
 * Jodi Carlisle as Marianne Thornberry

Guest Stars

 * Zac Efron as Jason Anderson: A sixteen-year-old rancher. He has a condition known as Temporary Blindness Syndrome, in which he often loses sight. Despite being this, Jason "sees" until he regains sight by both hearing and by feeling vibrations through his feet and/or through Spirit Storm and making cough like noises in a form of echolocation.
 * Matt Damon as Spirit Storm: A Kiger Mustang and Jason's horse.
 * Bill Farmer as Jock: A lonely, dim-witted yet very good-hearted wild horse who helps out Eliza, Debbie, Jason, Darwin, Irwin, and Donnie when they got lost in the woods. He became so loyal to Eliza that he snuck into the back of the comvee and becomes part of the Thornberry family.

Animals Featured in this Episode

 * Kiger Mustang
 * Brown Bear
 * Eastern Gray Squirrel
 * Canadian Robin

Trivia

 * Jason's personality and character is inspired by Toph Beifong from Avatar:The Last Airbender and Garrett from Quest for Camelot.
 * Temporary Blindness Syndrome is a fictional syndrome.
 * Spirit Storm and Jock are animated by James Baxter, who worked in the movie Spirit: Stallion of the Cimarron and also was a guest star in the episode of Adventure Time dedicated to him: James Baxter the Horse.
 * Jock is inspired by Pippi Longstocking's horse companion.