As the Enterprise approaches planet Omega IV, they find another starship, the U.S.S. Exeter, in orbit. Kirk, Spock and McCoy beam aboard to find the ship abandoned but strewn with uniforms and crystals. The last log entry from the ship's surgeon tells them they have been infected with a deadly virus brought aboard from a returning landing party. Kirk's party beams down to the planet's surface and finds there is one Exeter survivor: Captain Ron Tracey. He has apparently ignored the Prime Directive and has taken sides in a local dispute supporting the Kohms against their arch-rivals, the Yangs. As McCoy tries to find a cure for the virus, Spock and Kirk try to make sense of the situation. They eventually realize there is an odd parallel with Earth's own history. Written by
Did You Know?
The Kohm guarding Dr. McCoy can be seen in green coveralls in "The Man Trap", both in the corridor and in the turbolift, and as one of the miners in "The Devil in the Dark". He can also be seen extensively as a background character in many episodes of Kung Fu and Hawaii Five-O. See more
When Kirk is stating in his Log who shall beam down to the planet, he says "Lt. Galway" but the character's name is "Lt. Galloway." See more
Jim, the analysis of this so far is potassium 35%, carbon 18%, phosphorus 1.0, calcium 1.5. Jim, the crew didn't leave. They're still here.
Captain James T. Kirk
What do you mean?
These white crystals is what's left of the human body when you take the water away, which makes up 96% of our bodies. Without water, we're all just three or four pounds of chemicals.