Supermarionation "Thunderbirds", who closely resembled Sylvia Anderson, and Captain Blue in "Captain Scarlet", who looked like Ed Bishop (the similarity was reportedly coincidental). Other characters were based on well-known film actors: Troy Tempest of "Stingray" was based on James Garner, Scott Tracy of "Thunderbirds" on Sean Connery and Captain Scarlet on Cary Grant. "Stingray" also featured the only non-speaking Supermarionation puppet: the water-breathing woman Marina. Occasionally, close-ups of a live actor's hand would be inserted to show actions such as turning keys and pressing buttons. This was affectionately parodied in the 2004 live-action feature film "Thunderbirds", with a brief shot of
The Lodger (Doctor Who) of International Rescue," which is a reference to both Captain Troy Tempest from "Stingray" and International Rescue from "Thunderbirds", both series created by Gerry and Sylvia Anderson. Steven Cooper of "Slant Magazine" also saw a reference to the Emergency Medical Hologram from "", as the Doctor continued "Please state the nature of your emergency." "The Lodger" made up the seventh and final production block of the series along with "Amy's Choice". The read-through for both episodes took place on 17 February 2010 in the Upper Boat Studios. The story replaced another one, "The Doctor's Wife", when the latter was pushed