Ernie Reyes, Jr. is probably best known for his film debut at age 13 in the 1985 film The Last Dragon.
The same year he shared the screen with Arnold Schwarzenegger and Brigitte Nielsen in Red Sonja. During this time, he also had his own television series, Sidekicks, a spin-off of the original Walt Disney one-time special The Last Electric Knight, alongside Gil Gerard presented by Michael Eisner. He also appeared in an episode of the hit television series MacGyver in 1988. Reyes had starring roles in Surf Ninjas and in the second Teenage Mutant Ninja Turtles film The Secret of the Ooze as Keno, the pizza delivery boy. He also served as the martial arts stunt double for Donatello in the first Ninja Turtles film. He later appeared in movies such as Rush Hour 2 playing Zing and in The Rundown alongside WWE wrestler Dwayne “The Rock” Johnson. Reyes guest starred in the TV series Kung Fu: The Legend Continues alongside David Carradine.
In 2006, Ernie Reyes, Jr. hosted the MTV martial arts reality show Final Fu.
Ernie Reyes, Jr. has a professional fight record of 3–0 in Strikeforce which was a large Mixed martial arts organization but started out as a Muay Thai and kickboxing organization. Ernie fought Anthony Elkaim the WKA ISKA Champion. Reyes knocked out the champion in the 3rd round. His next two fights would be won by decision, including a unanimous decision over Veasna Thach which aired on ESPN. Ernie Reyes Jr.’s fight against the champion Anthony Elkaim also aired on ESPN.
Ernie Reyes, Jr. has done motion capture stunts for blockbuster movies such as Avatar and Alice in Wonderland. Most recently, Reyes guest starred on NCIS: Los Angeles “The Frozen Lake” playing “Jay Thapa”, a Nepalese soldier who is an expert in knife-fighting.