Prince Lazlo of Ambrasia is fascinated with the Texas Rangers and picks Laredo as the site to sign a treaty with Aguacaldo. His half sister Helena and consort Karl see this as their perfect opportunity to kill Lazlo, which they attempt with poison and a hired gun. Chad Cooper is a dead ringer for the Prince and Captain Parmalee decides they should switch identities for the Prince's safety. Reese believes the Prince to be Chad dressed up until the Prince passes out from drinking a shot of red-eye. The ruse is eventually figured out by Helena and Karl whose hired gunman goads the Price dressed as Chad into a gunfight. Chad is able to substitute for the Prince at the last moment and scares the gunman off with his fancy gun-handling. The gunman kidnaps the Prince and demands more money from Helena. Reese and Joe rescue the Prince and return him in time to sign the treaty and expose Helena and Karl.

Chief Kicking Bear and his tribe do not want wagon trains camping in their valley and threaten to attack the one camped there now. Captain Parmalee, Reese, Chad and Joe arrive to help. After a meeting with Kicking Bear and war eager Many Horses Parmalee sends Chad to fetch the Indian Affairs Commissioner. He assigns Reese and Joe to ride to the Indians camp to negotiate, stall for time, until Chad gets back. Parmalee stays with the train to keep the hot-headed wagon master from starting something. While in camp Reese competes in several games and wins them, attracting the attention of the Chief's hefty, giggling daughter Lost Bird, who decides she wants to marry him. Many Horses wants to marry Lost Bird and challenges Reese to several matches. Reese pretends to be injured for the last two contests and Joe steps in, winning the knife throw and the horse race. Lost Bird decides she now wants Joe for her husband. Chad arrives with the Commissioner and peace terms are agreed to.

Joe saves Jem Sing from a traitor of General Ti who has stolen her and Ti's opium. Jem Sing tells Joe, ""Sterling One, you save Jem Sing's life, now life is yours forever."" Joe becomes frustrated with her customs and her calling him master. General Ti wants to make Jem Sing his wife and is also trying to close an opium deal with the syndicate. He kidnaps Jem Sing and Joe from the Ranger barracks, wounding Parmalee in the process. The Captain grants Chad and Erik ""vacation"" to go after Ti in Mexico. They intercept the syndicate representatives and impersonate them. They join with Joe to escape Ti's cell and do battle with Ti and his troops as they attempt to foil the syndicate deal and rescue Jem Sing.