Twin Earth Story With a Twist!
The amazing model work is the first thing that strikes the viewer. This movie was in some ways an inspiration for Gerry's later Space:1999 with excellent rocket and space sets. The film starts with an interesting James Bond/spy thriller with some interesting ocular spy equipment and some politicial intrigue -- is the space program worth the expense? (Sounds familiar, but I digress).
Roy Thinnes (later starring in another great sci fi show, The Invaders The Invaders - Seasons 1 - 2), is the plucky American astronaut along with the astrophysicist John Kaine (played by Ian Hendry -- acting was not too bad -- the guy gets pretty beat up and is not fully developed in this film) are exploring the possibility of a new planet on the other side of the Sun!
Landing on a Counter-Earth (after much cool music and psychedelic lava lamps -- pass the Bogart, dude!) our good corporal believes things are not as they seem -- his wife is still a grouch, the woman security girl still has a crush on him, but the poor guy can't read a newspaper -- it's backwards!
The plot gets really thin after this and the ending is rushed. But hey, it's science fiction!
See this film for a decent tale of "earth on the other side" kind of story. This idea has been done before (Land of the Giants: The Full Series (The Giant Collection); Another Earth) but not with such cheesy finesse!