The Gunfighters is a serial in the British

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 science fiction television series Doctor Who

Doctor Who

Doctor Who is a British science fiction television programme produced by the BBC. The programme depicts the adventures of a time-travelling humanoid alien known as the Doctor who explores the universe in a sentient time machine called the TARDIS that flies through time and space, whose exterior...

, set in 19th Century America on the days leading up to the famous Gunfight at the O.K. Corral

Gunfight at the O.K. Corral

The Gunfight at the O.K. Corral was a roughly 30-second gunfight that took place at about 3:00 p.m. on Wednesday, October 26, 1881, in Tombstone, Cochise County, Arizona Territory, of the United States. Outlaw Cowboys Ike Clanton and Billy Claiborne ran from the fight, unharmed, but Ike's brother...

. This serial was first broadcast in four weekly parts from 30 April to 21 May 1966 on BBC1.
In the frontier town of Tombstone, Arizona

Tombstone, Arizona

Tombstone is a city in Cochise County, Arizona, United States, founded in 1879 by Ed Schieffelin in what was then Pima County, Arizona Territory. It was one of the last wide-open frontier boomtowns in the American Old West. From about 1877 to 1890, the town's mines produced USD $40 to $85 million...

, the troublesome Clanton brothers, Ike

Ike Clanton

Joseph Isaac Clanton was born in Callaway County, Missouri. He is best known for being a member of group of outlaw Cowboys that had ongoing conflicts with lawmen Wyatt, Virgil, Morgan Earp and Wyatt's friend Doc Holliday. The Clantons repeatedly threatened the Earps because they interfered with...

, Phineas and Billy, are in town in search of Doc Holliday

Doc Holliday

John Henry "Doc" Holliday was an American gambler, gunfighter and dentist of the American Old West, who is usually remembered for his friendship with Wyatt Earp and his involvement in the Gunfight at the O.K. Corral...

 to settle an old score over the death of another brother called Reuben.