Neville Folliot, a 19th century explorer, goes missing and his brother Clive sets out to find him. He stumbles across "The Dungeon", a place of strange atmospheric conditions, beings from distant galaxies and hidden pockets of time. Descending into the depths of an unknown planet, Clive Folliot and his band of heroes struggle to survive the traps of a strange multi-leveled prison. None of the intrepid characters from the far reaches of time and space know how or why they landed in the confines of the Dungeon or how they may escape. Their only clues to the intrigues of the Dungeon appear briefly in the journal of Clive's lost twin, Neville. In this fantastic abyss of serpents and spiders, aliens and cyborgs, Clive and his companions continue the quest for Neville and for a way home.