I remember that episode of “The Twilight Zone”.....it was called “Black Leather Jackets” and was written by Earl Hammer of “The Waltons” fame.
Three motorcycle guys in black leather jackets rent the house next door to Shelley Fabares...or at least the character she played. Denver Pyle played her father.
The motorcycle guys were actually alien invaders from another planet who, along with thousands of others, were plotting to put bacteria in the Earth’s reservoirs and kill everyone in order to colonize Earth.
One of the aliens fell for the Shelley Fabares character.
Love it!