Herry Monster was always my favorite. I might have had a hand puppet of him at one time. The character was retired by choice by Jerry Nelson, who was ill at the time and wanted to focus his energies on The Count. I’m assuming The Count’s still on in some capacity, played by someone else as Jerry passed on a few years…

There's a 1966 William Hartnell Doctor Who serial called The Gunfighters, so this isn't the first time the Doctor's been to the old west.