H, did you know James Arness was Peter Graves' brother (if you are a Mission Impossible fan). Graves didn't want it to look like he was piggybacking of his brother's success
@Thrust "The Invaders" was very much like American 1950's paranoia movies. Instead of having commies everywhere, you've got innocent-looking invaders from outer space, looking like humans (except they had a stiff pinky 😏) and undermining society and the government.