write by science fiction veteran gerry and sylvia anderson . this space fantasy be aptly direct by robert parrish . experienced american astronaut colonel glenn ross ( roy thinnes ) agree to a manned flight to the far side of the sun . the mission be to be control by jason webb ( patrick wymark ) and his euro sec space agency scientist john kane ( ian hendry ) will accompany ross . the two will explore a newly discover planet that be in the same identical orbit a earth . except it be always hide on the other side of the sun . ross be the only one to make it back to earth and have a very incredible story to tell . special effect may be good than the story line . nonetheless fun to watch . the cast also include represent lynn loring and loni von friedl and george sewell and herbert lom .