Excerpt from 'The Animatrix'

"Keeper of the Purple Twilight" is an episode of the original The Outer Limits television show. It first aired on 5 December 1964, during the second season. Scientist Eric Plummer comes under the sinister influence of a creature from outer space, capable of materializing in human form, but lacking human emotions. As a prelude for the invasion of Earth by his kind, an extraterrestrial being, Ikar, studies the human race. The one thing he cannot comprehend is emotion. Meanwhile, obsessed scientist Plummer is nearing a nervous breakdown, trying to complete a magnetic disintegrator that will convert matter into pure energy. As Plummer's weapon would aid Ikar's invasion force if completed, Ikar makes a deal with Plummer (who is unaware of Ikar's purpose). He will help Plummer complete the invention by offering his technical knowledge to provide the new equations necessary for the invention's completion in exchange for the scientist's ability to feel emotions for a "test drive".