Rent Invaders (1967 - 1968)

The Invaders is an American science fiction series about one man's struggles to prove that an alien invasion he sees coming is actually going to happen. The series follows David Vincent (Roy Thinnes), an architect who on a regular day happens upon a landing spaceship but is unable to prove it to anyone. When he is almost killed he vows to prove it to as many people as possible as to stop the invasion, something he continues to do by thwarting alien threats he picks up on and investigates.