In this pilot episode, Dan Troop takes over in Laramie after the previous marshal is killed. His first job is to bring in the marshal's killer, and in the process he gains a fine deputy in Johnny McKay. (This is also the first of several episodes where veteran actors Jack Elam and Lee Van Cleef appeared.)

The buffalo hunters, led by Tom Cardigan, are persecuting little Billy Bright in the saloon because he used to be married to a Shoshone Indian. The Shoshone are on the warpath because Cardigan killed the chief's brother. Troop stops them and then lets Bright go, but then he learns that the buffalo men hung Bright outside of town. He goes to try to stop a war, and the Indians attack him and the buffalo hunters.

Lily Merrill opens the Bird Cage Saloon after being thrown out of Billings, Montana by the sheriff. Dan hears she was involved in a theft/murder, she assumes he wants to be paid off. Dan, of course, refuses money. Both seem surprised that their opinions are wrong, but Dan is still suspicious. One of her dealers again causes trouble, and she looks guilty. There are several mistakes made by Dan (unusual for him) regarding her innocence until the very last scene, where they gain lasting respect for one another.