Hugh O'Brian Wyatt Earp Actor Morgan Woodward Shotgun Gibbs Guest Star Stacy Harris John P. Clum Guest Star Randy Stuart Nellie Cashman Guest Star Trevor Bardette Old Man Clanton Guest Star Al "Lash" La Rue Sheriff Johnny Behan Guest Star William Mims Dameron Guest Star James Seay Judge Spicer Guest Star John Baxter Frank Stillwell Guest Star Roy Rowland Director Frederick Hazlitt Brennan Writer