It can't be used in any way but its original purpose within Toobworld "reality", but here's Boris Karloff as 'Colonel March Of Scotland Yard' with guest actor Christopher Lee as suspect Jean-Pierre in the episode "At Night All Cats Are Grey". (I love that title!) But if it had been a horror movie subset of the "Cineverse"? Spine-tingling!
(Sorry about the quality of the transfer.....)