There is a certain buzz in the air of the studios at Purley Broadcasting Corporation.  Filming of a new sit-com is about to start in front of a live audience.  Bernard, the director, expects the “He’s in the Cupboard” will be a success, and everything is on schedule until a the leading actor pulls out.  Soon the cast are dropping like flies and it is a battle to find replacements before the show is beamed out across the network later that night.