Attack of the Crab Monsters
Roger Corman's (yes, THE Roger Corman) 1957 "Attack of the Crab Monsters has one of the most compelling titles of anything on The Odeon to date. Most reviews consider this just a tad better than the average drive-in b-schlock being produced in the mid to late 50s, thought I'm on the fence about that myself.
A group of scientists land on a remote island in the Pacific to search for a previous expedition that disappeared and to continue research about the effects of radiation from the Bikini Atoll nuclear tests on the island's plant and sea life. They learn to their horror that the earlier group of scientists have been eaten by mutated giant crabs that have gained intelligence by absorbing the minds of their victims. Ah nuclear monsters, when will this happen in real life?