Despite Trina's warning not to follow as she sets out to stop Bex Hunter, Dinoster heads into the evil mastermind's secret volcanic lair. Once there they find themselves face to face with Red Rex and an army of Armorsaurs and trapped in a dungeon of perilous lava. Will a Quad-Combo upgrade be enough to stop Bex and get them all to safety, or will the volcano be their molten grave?