What's happening?

Space: 1999: 1x14

Earthbound

An alien spacecraft crashlands on the Moon, its passengers refugees from a dying world. As their destination is Earth, they generously offer to take one person with them when they depart. The scheming Commissioner Simmonds takes steps to ensure that he is the lucky individual chosen, even if it means destroying Alpha.

Space: 1999: Season 1 Episode 14
Dec. 04, 1975