Mickey Spillane's hard-hitting '50s private eye, Mike Hammer, returns to television in the guise of Kevin Dobson to track down the killer of his best friend who was driving Hammer's car. Joining in the hunt are the detective's Girl Friday, the ever-hopeful Velda, and his cop friend, Pat Chambers.

Promising young racing car driver Joe Joe Quillico leaves the stock car racing scene in the United States in order to pursue Grand Prix racing in Europe. After limited success he manages to win the Spanish Grand Prix. His love life however, is much less successful and his winning on the track only serves to alienate the woman he loves - with unhappy consequences.

A young man visits his fiancé's estate to discover that her wheelchair-bound scientist father has discovered a meteorite that emits mutating radiation rays that have turned the plants in his greenhouse to giants. When his own wife falls victim to this mysterious power, the old man takes it upon himself to destroy the glowing object with disastrous results.