The murder of her father sends a teenage tomboy, Mattie Ross, (Kim Darby), on a mission of "justice", which involves avenging her father's death. She recruits a tough old marshal, "Rooster" Cogburn (John Wayne), because he has "grit", and a reputation of getting the job done. The two are joined by a Texas Ranger, La Boeuf, (Glen Campbell), who is looking for the same man (Jeff Corey) for a separate murder in Texas. Their odyssey takes them from Fort Smith, Arkansas, deep into the Indian...

A scientist performs experiments involving intelligence enhancing drugs and virtual reality on a simple-minded gardener. He puts the gardener on an extensive schedule of learning, and quickly he becomes brilliant. But at this point the gardener has a few ideas of his own on how the research should continue, and the scientist begins losing control of his experiments.

The Elder boys return to Clearwater, Texas for their Mother's funeral. John the eldest is a well known gunfighter and trouble follows him wherever he goes. The boys try to get back their ranch from the towns gunsmith who won it from their father in a card game with which he was shortly murdered there after but not before getting through the troubles that come with the Elders name.