The Colour of Magic

Inside a magical realm known as Discworld, a naive tourist is on holiday until a terrible fire breaks out, forcing him to flee along with an incompetent wizard. As the clueless pair set out on a magical journey across the disc, neither realizes that they are merely pawns in an elaborate board game being played by the Gods. After encountering a pair of barbarians, they take a trip to an inverted mountain housing dragons that only exist in imagination, survive a fall off the edge of the disc and attempt to beat the wizard's former classmate to a collection of spells that could save Discworld from total destruction. (official distributor synopsis)