The Corbomite Maneuver
Kirk uses a desperate gamble—the corbomite maneuver—to save the Enterprise from destruction at the hands of Balok, a mysterious alien who accuses him of trespassing. This episode introduced the characters of Dr. McCoy and Yeoman Rand. Balok: Clint Howard. Bailey: Anthony Call. Spock: Leonard Nimoy. Dr. McCoy: DeForest Kelley. Yeoman Rand: Grace Lee Whitney.