In October 1881, having learnt of the arrival of the Clantons in Tombstone, Kate tried to persuade Holliday not to fight them. She helped Doc disguise the First Doctor as himself. At the saloon, she pretended to the Clantons and Seth Harper that the Doctor was Holliday. She and Holliday left town when Wyatt Earp was "gunning" for Holliday.
Behind the scenes
In the novelisation of the story, the character is named Kate Elder. In reality, "Big Nose Kate" was an alias, with Mary Cummings being her real name.