There is a moment in the Doctor Who story The Sea-Devils when an imprisoned master is watching a very seventies telly, specifically an episode of The Clangers, believing it to be a documentary on a funny alien species. He is genuinely disapointed to discover they are in fact just a children's television creation. It was one of those meta moments that Doctor Who was capable of delivering in a way few shows before or since have done. And it was also an example of why Roger Delgado's interpretation of The Master was so beloved even though he could be terrifying and utterly untrustworthy.
A meta moment when Peter Firman strayed into the world of Doctor Who. Happy Days.
