Attack of the Crab Monsters
Not of This EarthDVD - 2004
Attack of the Crab Monsters: A group of scientists are trapped on a remote island inhabited by atomically mutated giant crabs. Not of this Earth: A humanoid alien from outer space is sent to earth to bring back human blood to his home planet for transfusion purposes.
From Library Staff
And just when you thought the giant-telepathic-crab genre was dead. Prophetically, Russell Johnson (of Gilligan’s Island fame) plays a professor who creates gadgets to get him and his friends off the crab-infested island.