This is cut-rate science fiction from Allied Artists and producer-director Roger Corman. The United Nations space program involving launching manned spacecraft into outer space is met with defeat after defeat as a strange energy barrier surrounding the planet destroys any craft that gets too close. One last chance is taken with an experimental solar device which will hopefully subvert the energy field, only unbeknownst to the programs members, the proposed captain (Richard Devon) has been replaced by an alien duplicate bent on stopping human efforts in space exploration once and for all.
This was rushed out in reportedly eight weeks, from conception to theaters, in an effort to cash-in on the Sputnik launch in the news. The special effects aren't very special, and a good bit of the film's final third is comprised on people walking back and forth through the same 10-foot stretch of ship corridor. But I liked seeing Richard Devon, a familiar character actor, in a lead role, and there are some fun moments when his true alien nature pops up. Longtime Corman regular Dick Miller gets one of his very few heroic leading man roles, and he uses a more serious voice than normal, much to my amusement. Susan Cabot acts a bit like a robot. This movie is no one's idea of high art, but it hit enough of the right B-movie buttons for me to be entertaining.