Saber Rider recalls how he, April, Colt and Fireball met and became the dynamic frontier fighting team: Saber Rider and the Star Sheriffs. Saber Rider arrives on Planet Yuma for his assignment to the special project, Ramrod, which is being led by April. He discovers that the Outrider, Vanquo, is plotting to undermine Ramrod, and, with the help of Fireball and Colt, who are on Yuma pursuing their own interests, Saber Rider defeats the Outriders and their gigantic battle machine, Renegade. With April's encouragement, the group decides to stay together to help tame the new frontier.

When the Star Sheriffs arrive to investigate a destroyed Cavalry Command base, they are attacked by Outriders. One of the Star Sheriffs must go on a maverick mission to defeat them. Using a trick coin, Colt wins the toss against Saber Rider and flies off to battle the enemy, who trap him in a canyon. But, help comes from an unlikely source: a little iguana that Colt has befriended. With the iguana's help, Colt escapes and joins the other Star Sheriffs in defeating the Outriders.