Psychiatrist "Danny" and the Plants
Anyone else get a kick out of Larry Gates' character here messing with the pods in Jack's greenhouse (and probably that huge one) foreshadowing his character "Mr. Endicott" 11 years later in "In the Heat of the Night?"
I don't think he slaps anyone in this film, though.
Someone said Gates also played in a TV series episode concerning aliens replacing humans.
Coincidence?
PS I always smile when I see Whit Bissell in yet another film. Virginia Christine, too. In the latter's case I keep hearing her say "It's mountain grown." Character actors who left their marks in many ways.