I guess when John Agar came to Hollywood, they thought he was going to be the next Cary Grant. So what does he end up doing: cheap monster movies. He was adequate as the doctor in "Tarantula." In this one, he must be embarrassed. He is so stiff and must act opposite dreadful people. The mad scientist who makes contact with Zontar is about as emotive and unappealing as one can get. His wife is even worse. Don't try to think about the believability of all this because it absolutely defies even the most primitive logic. Who are these people and why are they so important? How do you get Venus on an old time radio? They even refer to it as a "set." Zontar is, himself, just an ugly bat guy. Of course, fortunately, the scientist just happens to own a "ruby plutonium laser gun" which is the one thing that can kill Zontar. If he's that nutty about the good intentions of the alien, why does he have this? Did he build it? Don't ask. I did love the arguments between the guy and his wife, but that's because it's the most dreadful acting one has ever seen.