Doppelgänger

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
• 
  George Sewell

  Mark Neuman
• 
  Ed Bishop

  David Poulson
• 
  Philip Madoc

  Dr. Pontini
• 
  Vladek Sheybal

  Psychiatrist
• 
  George Mikell

  Captain Ross