 As with all games in the "Pendragon" series, "Entombed" was programmed by Dave Thomas, whereas the graphics were designed by Bob Thomas.Dave Thomas admitted in a March 2008 interview that the name of the series protagonist, "Sir Arthur Pendragon", was copied from the character of the Black Prince Pendragon from the "Jack the Giant Killer" stories.According to Dave Thomas, "Entombed" had the longest development cycle due to the expansion of the previous engine.