A 1959 monster movie starring James "Roscoe P" Best.Thorne Sherman is the captain of a small supply boat sent to bring provisions to a lab on an isolated island. When he arrives, inclement weather prevents the offloading of provisions, and he finds the resident scientists nervously awaiting him with guns. Much Natter and beating around the bush ensues, until finally the truth comes out: The scientists have been performing experiments on overpopulation by genetically engineering shrews which grow to the size of sheep dogs, eat incessantly and breed profusely. These giant shrews have escaped and are overrunning the island, stripping it of food until the monsters must turn on the humans, trapping them in the small house/lab.Unfortunately for the humans, the rains are weakening the house's adobe walls, allowing the Killer Shrews to burrow their way in. Although only a couple shrews actually make it inside, it's enough to kill a house servant and a lab researcher; the shrews also gobble up Thorne's sidekick Rook whilst attempting to bring items ashore from the boat). Realizing they can't stay in the house because the shrews are getting in, but can't go out of the house because the shrews are out there, Thorne gets creative and builds a portable tank out of empty oil drums. He, his Love Interest and her father the lead scientist all escape to the beach in this tank and finally ditch into the ocean and swim out to Thorne's boat (now safe, since shrews can't swim); but the last lab assistant panics and refuses to join them in their escape, and so gets himself eaten. The shrews are left trapped on the island, where it is assumed they will eventually starve and die off.For the Mystery Science Theater 3000 episode see here.
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