David Brian

À la recherche de John Gill, un observateur culturel, le vaisseau Enterprise est attaqué et subit de violents bombardements de missiles thermonucléaires. Afin de localiser l'agresseur, le capitaine Kirk et Spock s'envolent pour une autre planète.

Matt's friend becomes a murderer because of his fanatic opposition to the killing of a renegade wolf.

An outlaw grabs a hostage while Matt is trying to arrest him and forces Matt to work out a deal.

A sequence of tragedies leads to the death of three cowboys, one of them a friend of Matt's.