The Outer Limits

S02:E12 - Keeper of the Purple Twilight

The lack of two equations needed to complete his work drives scientist Eric Plummer (Warren Stevens) to the brink of suicide. When an alien creature (Robert Webber) appears and offers the answers, Plummer readily accepts, but in return must surrender to the alien all of his emotions -- including love. But why does the alien want the project completed? Is he working alone? And is he as immune to human emotions as he thinks he is? For the answers, you'll have to take a trip to "The Outer Limits."