Starodavne pošasti, za katere so mnogi mislili, da so samo miti, se ponovno dvigajo. In ne le to - intenzivno si prizadevajo za prevlado nad človeštvom. Vprašanje je, ali je obstoj pošasti in ljudi sploh možen in zdi se, da je človeška vrsta močno ogrožena. Kriptozoološka agencija Monarch se sooča z množico uničujočih pošasti, vključno z mogočno Godzilo, ki se spopade z Mothro, Rodanom in njegovim končnim nasprotnikom, triglavim kraljem Ghidorahom.
A 17th-century Caribbean port rumored to have frequented by pirates rises from the ocean floor, where it came to rest after an earthquake many years before. A scientist wants to study it, some thugs want the treasure alleged to be stored there, a bunch of mutated giant crabs living there attack them all.