The Cyclops

Test pilot Bruce Barton is missing and his girlfriend, Susan Winter, organizes a search party, which is sent out in the jungles of Mexico. Scientist Russ Bradford, mining expert Martin "Marty" Melville, and pilot Lee Brand fly into unknown territory. While searching the area, however, they uncover giant mutated Earth animals such as a mouse, an eagle, a mygale, a green iguana, a tegu and a boa.