"So come, you coyotes, and howl at the moon 'til there's blood upon the sawdust in The Last Chance Saloon..."

It's 1881 and, in the Wild West settlement of Tombstone, there are three strangers in town: "Doctor Caligari", "Steven Regret" and "Miss Dodo Dupont". They're arrived in a 20th Century blue police box, and they're about to wander into a whole heap of trouble...

The Doctor is in need of a dentist, but the sort of anesthetic Doc Holliday uses comes out of a liquor bottle. He's in the middle of a feud with the Clanton family, whilst Wyatt Earp and Bat Masterson try to keep the peace. This isn't the place for a relaxing holiday, as the TARDIS crew soon discover...

Tombstone's not the most happily named of towns, and it seems it may live up to that name any day now. There's a gunfight at the OK Corral brewing and, if the Doctor and his friends aren't careful, they're going to be caught in the crossfire...