Dr. Leonard "Bones" McCoy meets a former girlfriend when the Enterprise brings supplies to a remote archaeological survey group. Still attractive to McCoy, the woman's current appearance and her colleague hide a deadly secret, ultimately revealed as a tragedy of ecology.
Collecting a $30,000 Mexican reward becomes a matter of life or death for two bounty hunters.
When Gideon Seek refuses to take sides in a range war, cattlemen kill his sheep and burn his farm.
Tod and Buz take labor jobs on a Louisiana offshore oil rig. Tod immediately finds the behavior of a seemingly out-of-place older worker to be odd. As Tod continues to watch the man he finds the strange behavior has a sane purpose-the man is a Nazi hunter who is closing in on his prey.
Steve suffers temporary blindness when his face is sprayed with hot engine oil from a malfunctioning airplane, but despite his vision loss, he must take over the controls of the airplane to save the life of a senator. Pat Hingle guest stars.
