The Twilight Zone: Season 5, Episode 18

5 - 18: Black Leather Jackets

A trio of aliens, dressed as "hoodlums" in black leather jackets, arrive in a small town, look to eradicate all life on Earth so their kind can expand on a new planet. However, one of the aliens falls in love with a local girl and is hesitant to go along with his friends' plans and ultimately tries to talk her into leaving town with him.