A planet is discovered in the same orbit as Earth's but is located on the exact opposite side of the sun, making it not visible from Earth. The European Space Exploration Council decide to send American astronaut Glenn Ross and British scientist John Kane via spaceship to explore the other planet.
Roy Thinnes
Colonel Glenn Ross
Ian Hendry
John Kane
Patrick Wymark
Jason Webb
Lynn Loring
Sharon Ross
Loni von Friedl
Lisa Hartmann
Franco De Rosa
Paulo Landi
George Sewell
Mark Neuman
Ed Bishop
David Poulson
