The reason I watched this film is because of a screenshot from this film. It's a picture of a naked woman plugging things into a large machine. It made no sense, and the film is certainly guilty of that at times. What I liked was the time travel theme, and the fact that it was a weird low-budget film.
Patient, soft-spoken, & unsentimental, IT requires similar quiet attention & unsentimentality from viewers. Time travel & young women in panties are its 2 concessions to conventional H'wood appeal, but Fonda treats those elements w/ deadpan casualness. IT's dystopia owes THX 1138 & Alphaville a debt but gives off a warmth those films lacked. A harsh/comic ending obscures Fonda's intentions w/o diminishing his vision.