The 1983 film Strange Invaders, from writer/director Michael Laughlin, was originally intended to be the second of a "Strange" trilogy with 1981s Strange Behavior as the first in the series. Unfortunately, this movie failed to find an audience and poor ticket sales meant the third film was not to be.
I was introduced to Strange Invaders from a split review on Gene Siskel and Roger Ebert's At the Movies television show. Couldn't locate it in theaters, but rented it as soon as it appeared in my local video stores new release section.
The plot is a tribute of sorts to 1950s science fiction films, especially Invasion of the Body Snatchers. Aliens land in a rural Illinois town in the late fifties, replacing all the residents, while they slowly study the Earth in order to see what their next move will be. Fast forward to the 1980s as Paul Le Mat's wife, played by Diana Scarwid, has not returned from a trip to that rural town for her mother's funeral. Thing's escalate quickly after Paul Le Mat's harrowing trip to that town results in him uncovering the aliens secret but few others take his claims seriously.
Siskel & Ebert on
At the Movies - 1983