Of his casting, Skinner said:
I love this show. I subscribe to Dr Who magazine, I've got a TARDIS ringtone, a five-foot cardboard Dalek in my bedroom and when I got the call saying they wanted me to read for the part, I was in the back of my tour bus watching episode three of The Sensorites. I am beyond excited.
Mathieson himself posted on his blog:
I was a stand up for a living for quite a few years. When I was trying to figure out how to do it in 1996, his first two stand up videos were part of my boot camp, so there is a nice synchronicity for me to be writing lines for him to deliver nearly twenty years later.
Showrunner Steven Moffat added:
It's no secret that Frank's been pitching vigorously to get into Doctor Who for a while. He's been volunteering to be 'third monster on the left' as long as I've been in this job. But now, in Jamie Mathieson's sparkling script, we finally have a part that can showcase all of Frank's famous wit and charm. Hopefully he'll get out of my garden now.
The episode, directed by Paul Wilmshurst, will also feature two actors who have previously appeared in Doctor Who. Janet Henfrey, who played Mrs Hardaker in The Curse of Fenric (1989); and Christopher Villiers, who starred as Hugh in The King's Demons (1983). It has also been announced that David Bamber (Rome, What Remains) and Daisy Beaumont (The Armstrong and Miller Show, A Touch of Cloth) will appear in the episode.