 Cheyenne and Smitty come across a wagon train lost on their way to Wyoming Territory. Cheyenne agrees to guide them as far as Fort Laramie where they can get a guide. Rustlers descend on their camp at night and steal more than 200 head of cattle from the settlers. Cheyenne figures they ll try to sell the cattle at the nearby town of Julesburg. He and Smitty head into Julesburg undercover to try and get the cattle back.