My review was written in March 1982 after a TImes Square screening:
"Parasite" is a low-budget monster film which utilizes the 3-D process to amplify its shock effects. Outlook is okay to attract fans of horror pics and depth films.
Set in 1992, tale has a skimpy sci-fi peg, of scientist Dr. Paul Dean (Robert Glaudini) attempting to neutralize a strain of parasite he has developed for the government. Morbid premise (accounting perhaps for Glaudini's glum, almost laughably downbeat line readings) is that the large, worm-like parasite is in his abdomen growing while he studies another specimen, racing to somehow avert his own death and save the world from millions of offspring.
Post-nuclear war locale is a remote, western town, with fashions resembling today but gas up to $40 per gallon. Filmmaker Charles Band is weak on transitions and story development, ending many scenes arbitrarily with a fast fade. Nominal tension is generated by merchant (industrial class controlling society) James Davidson pursuing the hero while both use futuristic laser guns to deal with the young punk locals.
Pic's raison d'etre is a set of frightening mechanical and sculpted monster makeup effects by Oscar-nominated (for "Heartbeeps") Stan Winston, aided by James Kagel and Lance Anderson. Convincing gore and sudden plunges at the camera are enhanced by StereoVision 3-D filming, with cameraman Mac Ahlberg creating some interesting foreground-dominated compositions among the standard shots. Otherwise "Parasite" is lethargic between its terror scenes, making it a test of patience for all but the fanatical followers of horror cheapies.