Joey Two Trees

 was a Native American scout who helped the United States Deputy Marshal Bass Reeves track down wanted men in the Indian Territory.

In 1880, Reeves and Joey saved Bill Potts from being held hostage by the wanted killer Seth Shelton, and had Shelton arrested, intending him to be taken to Arkansas to stand trial. Joey showed the Twelfth Doctor and Reeves that a stag had its heart ripped out of its body. (COMIC: The Parliament of Fear)