Though the premise is of course absurd, "Giant from the Unkonwn" is a cut above most B-grade horror films of its era. The difference lies in the cast. Bob Steele, veteran of over 200 films and a familiar face in Westerns, does a very good job as the local sheriff. His gestures, facial expressions and easy mastery of the material give the film its backbone. Morris Ankrum, who plays the inevitable scientist, likewise brought an impressive background to the role. He is probably best known today for his recurring role as a trial judge in Perry Mason, but like Steele he had already been in hundreds of movies when "Giant" was filmed. The supporting cast is good, and manage to approach the silly premise of a giant conquistador on the rampage with a straight face. It's a worthy effort, though it would have been nice to have a better script and a slightly less silly premise.
Review of Giant from the Unknown
