The Beast of Yucca Flats is a 1961 horror movie.
It is less than an hour long but too dreadful to warrant even that little amount of time. Boring and incoherent.
1000 Misspent Hours and Monster Hunter have reviews. Neither recommends it.
5/25/2010: 366 Weird Movies says, "The paradox of this film is that, while Beast is boring, it’s boring in an interesting way."