Bat Masterson roams the frontier and defends the innocent.

Bat faces a series of challenges as his crew builds a railroad in Colorado, including natural disasters, lost equipment and charges against Bat for a murder he didn't commit.

When Bat comes to the aid of a marshal friend in Dodge City to stop a power-hungry land baron named Silas Guild, he learns the marshal's intentions are less than noble.

Bat delays his plan to attend a poker game in order to protect an important gunpowder convoy on its way to Fort Stewart, but its armed escort has been decimated, and its wagon drivers appear suspicious.

Bat travels to a Texas ranch to drive cattle for rancher Orin Dilts, but Orin stands accused of burning down the local land and the Grant family suspects Bat to be his hired gun.