Cave and his ad hoc team of spelunkers (his daughter Chloe and best-bud mechanic Jack Wheeler) have answered the call to adventure! But as they search for the lost city of Muldroog, Cave's employer sends a crack team of his own in the latest in subterranean transportation: the Mighty Mole MK 2, led by a famed explorer from Cave's past. And it looks like they're out for more than just the return of EBX property...