You Don't Walk Alone

Kelley had something there. Every time you think of an invasion from outer space, you think of a hundred huge rocket ships settling down with ray guns going full blast and king-sized atomic bombs breaking up the landscape. Actually, of course, it doesn't have to be like that at all. Granted a physical resemblance in the first place, then maybe it wouldn't be an invasion. It might be more of an ... infiltration.