Another Time, Another Place Space: 1999 : Season 1 Episode 16
TV-14 (self-applied) ITV 50m int(0)
Aired: December 18th, 1975 @ 12:00 AM EST on ITV
After an encounter with a space-time anomaly, the Alphans find their Moon back in the Solar System on a course to re-enter Earth orbit. The celebration ends when it becomes apparent Earth is an inhospitable wasteland. The mystery deepens when they discover a duplicate Moon already in orbit and a duplicate Moonbase Alpha lying empty and deserted.