Executive producer: Gene Roddenberry
Associate producers: Edward K. Milkis and Gregg Peters
Producer Fred Freiberger
Co- producer: Robert H. Justman
Story consultant: Arthur H. Singer

Writer: Lee Cronin
Dir.: Vincent McEveety

Captain Kirk: William Shatner
Science Officer, First Officer, Cmdr. Spock: Leonard Nimoy
Dr. Leonard "Bones" Mc Coy: DeForest Kelly
Lt. Sulu: George Takei
Lieutenant Commander Montgomery Scott: James Doohan
Lieutenant Uhura: Nichelle Nichols
Doc Holliday: Sam Gilman
Wyatt Earp: Ron Soble
Virgil Earp: Charles Maxwell
Morgan Earp: Rex Holman
Voice of Melkotian warning buoy: James Doohan

Stardate 4385.3

On the border of the Melkotian area the Enterprise ignores a warning buoy. After facing a Melkotian image at their screen Kirk, Spock, McCoy, Scotty and Chekov beam down at the planet and encounter Doc Holiday, Wyatt Earp, Virgil Earp and Morgan Earp. All set in front of facades of buildings resembling the wooden houses in America at the time of early settlements. While everybody seems to be at home, the crew is clearly seen as the Clanton brothers. 

When they ask about their appearance they get confirmed that they never looked any different. To add to the inconvenience the crew cannot leave the area. A power force around the village prevents any proceedings. All tries of normal conversations seem useless; they are not only seen as the Clantons, who are involved in the famous O. K. Corral gun fight (where only Billy Clanton survived), but they frequently run into trouble with the Earps. To bring the hostilities to an end the time for the shoot-out is set. Again they try to leave the place, but wherever they try to go, they finf themselves at the O. K. Corral. In the short time left all work on solutions, like a special mixture to render the other party unconscious. 

One of the ladies working in the saloon becomes the Chekov's (alias Billy Clanton's) friend. In a struggle, Chekow gets shot and killed. Realizing that he was the only survivor of the gun fight, Spock is sure that nothing is real in this place- only what they believe to be true. It proves right because the mixture which is supposed to be strong enough to put a person to sleep for a long time has no effect at all. Spock explains that Chekov wasn't killed by the bullet, but by his believing it to be lethal. 

Suddenly they find themselves in the Corral, while the Earps and Doc Holliday are approaching – ready to kill them. Applying the Vulcan Mind-Meld on Kirk, Scott and McCoy, Spock prepares each of his friends for the situation. All is seen to be unreal and cannot harm them. As the others open fire, the bullets indeed do not do any harm. Finally, fist fights follow. As Kirk is in the position to kill one of them, he does not – by this proving the peaceful intentions of the people of the Federation to the Melkotians. They had taken the scenes out of Kirk's fantasy and had exposed all of the landing party to the setting. Believing the Federation is a non – aggressive Federation, the Melkotians plan to establish a diplomatic relationship with them.