"Black Leather Jackets" is an episode of the American television anthology series The Twilight Zone

The Twilight Zone

The Twilight Zone is an American television anthology series created by Rod Serling. Each episode is a mixture of self-contained drama, psychological thriller, fantasy, science fiction, suspense, or horror, often concluding with a macabre or unexpected twist...

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Synopsis

Three beings, disguised as human males wearing leather jackets, are part of an advance alien invasion force, sent to Earth to infect city water reservoirs with bacteria. Their plan is to thus kill all humans and domestic animals. Their own race needs room to expand, and this is an easy way to take over the Earth for themselves. The excuse given by the alien leadership, for the extermination, is that humans are violent and hateful and therefore deserve to be destroyed. The youngest of the three, called Scott, falls in love with the girl next door, Ellen Tillman. He tries to convince the leader of his world that not all men are evil and that love exists among people of the Earth, but to no avail.

Scott tries to convince Ellen to run away with him so that she will escape death, but Ellen is so terrified of his claims, she believes him to be mentally disturbed, so her father calls the local sheriff, whose deputy answers the phone, to take Scott away. The deputy turns out to be part of the invasion force, intending to punish Scott for his defection, and the Tillmans comfort their daughter, not realizing they are doomed.