Happy Village was already having a bad day when an earthquake rocked the county and dropped the town into a chasm populated by prehistoric beasts. After watching a creature thought extinct for millions of years devour a Happy Villager, terrified survivors seek a way out, only to discover more dangers, small and great, scaled and feathered, as they attempt an escape from the terrifying underworld lost to time and the fantastic and ravenous dinosaurs lurking therein.
