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.