The Trap Door is primarily a children's clay animation show from the mid 1980's aired in the UK, despite it being initial a kids show its found a new audience with those that have grown up with it over the past three decades. It was created by both Terry Brain and Charlie Mills and ran for a total of forty episodes over two whole series. All the voices were provided by the legendary Willie Rushton, while the now famous theme tune was written by Bob Heatlie. Each show lasted around five minutes, and the lead character Berk often encountered numerous bizarre creatures that crept out The Trap Door, while serving his master, otherwise known as The Thing Upstairs. He wasn't alone however, he had his friends moaning Boni and mischievous Drutt to assist him in his daily adventures.

The show has seen many incarnations over the years, including the release of the show on VHS tapes (although not in a complete collection), and more recently on DVD entitled The Trap Door - Complete Collection, which has proved to be highly successful, specifically in the United Kingdom. For those old enough to remember it was even released as a computer game called The Trap Door, and was followed up by Through The Trap Door. Both these games were released in the mid 1980's on the ZX Spectrum, Amstrad CPC, and not forgetting the Commodore 64. If that wasn't enough the merchandise included a board game entitled Berk's Trapdoor Game.