One thing you've got to hand to Gerry and Sylvia Anderson. Not only were they on the forefront in terms of creating excellent science fiction with wonderous costumes, sets, and the like, they also create science fiction with an excellent, if not bizarre twist to it. Much like 2001 and Planet Of The Apes. They would go on later to create Space:1999(another science fiction classic).
I first saw Journey To the Far Side Of The Sun at my grandmother's on a Saturday afternoon, watching it on the Saturday afternoon movies portion on one of the local television stations, and I must say that I was totally blown away by its plot twist. A mirror-Earth on the far side of the sun. And the explosive ending where astronaut and U.S. Air Force Colonel Glenn Ross(played by the great Roy Thinnes)tries to make an emergency landing in his spacecraft. The film was definately a quantum leap in science fiction. Especially with a plot twist that would have made a good Twilight Zone episode. Everything about this movie was great. From the plot to subplot, to the acting, etc. It is truly a cult classic among fans, especially those of the Andersons.
Roy Thinnes, as always, does an excellent job with the material he is given. From an astronaut that has marital problems, to being in a weird and bizarre situation, he does an excellent job of playing someone who is in the most strangest of circumstances. The other actors also do an excellent job as well. The soundtrack by the late Barry Gray, very powerful and moving. Especially in the scene where Thinnes is in front of a mirror in the space center administrator's office, putting the pieces of the puzzle together.
If you enjoy science fiction with a twist, be sure to check out this film. Man has gone to the moon. Now take another extraordinary journey!