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When the inhabitants of Petrie's island succumb to a mysterious disease, doctors Brian Stanley (Peter Cushing) and David West (Edward Judd) are asked to investigate. Puncture marks on the corpses reveal the horrifying truth: the islanders and their animals are being killed not by a disease, but by a strange type of silicate organism that sucks the bone from their bodies. As the death toll rises the seemingly indestructible creatures multiply at an alarming rate. Stanley and west lead the desperate islanders in a fight for survival as the unstoppable silicates threaten to engulf the island, and then the world.