The Alpha Incident (1978)

This was Bill Rebane's follow up to his more famous Giant Spider Invasion (75). The plot concerns a space probe returning to Earth from Mars, bringing with it a deadly organism. The Giant Spider Invasion was a big success for Rebane, so that may be why he could afford actor Ralph Meeker for this one; Meeker was taking a step down, going from Bert I. Gordon's Food of the Gods (76) to this grade Z picture.