
The original Dungeon Keeper was first released in 1997 and was developed for Windows PC by Bullfrog Productions under Peter Molyneux. Players build and manage a dungeon, populating it with traps and minions to protect it from enemies polygon.com

It was taken after one of his three moonwalks with crewmate Harrison Schmitt, though you could be forgiven for assuming that Cernan just came in from a shift at the coal mine rather than a jaunt across the surface of the Moon. boingboing.net