It's Black & White, it's 1961 and it's VERY corny. ''The Beast of Yucca Flats'' is the classic 1960s ''B''-Movie schlock which starred the memorable Tor Johnson (ex-Wrestler and ''B'-Movie Favorite), as a defecting Soviet Scientist with Top Secret ''intell'' for The US. Meeting His ''Contact'' (in all places, out in the middle of The Desert), The Scientist is nonetheless tracked down by Russian Agents. His Contact killed, The Scientist begins to try and escape by foot through The Desert. He wanders onto an Atomic Test Site and (you got it), He's just in time for an Atomic Bomb Test (BOOOM). The Scientist is not killed, but is turned into an irradiated ''Beast'' (with really bad scarring make-up). ''Beast'' wanders the countryside killing whomever crosses His path (which is mostly beautiful girls go figure!)
Eventually cornered by The Police, The ''Beast'' is not killed by some top secret weapon, but Police with rifles (who'd have thought). Dying in The Desert, The ''Beast's'' last act is to pet a Bunny Rabbit hopping by.....(Yes, You read that right!). Arguably, ''Plan 9 From Outer Space'' (of which Johnson starred in that One too), has always had the Title as ''Worst Film Ever Made''. Many also point to ''The Beast of Yucca Flats'' as a very ''close'' contender.
