Episode Title: "THE MARK OF GIDEON"
Production Number: 72
Original Air Date: 01-17-69
Stardates: 5423.4, 5423.8
The U.S.S. Enterprise arrives at the planet Gideon, which is under negotiations for United Federation of Planets membership, but has not allowed any delegations from the Federation to visit or scan the shielded planet. Captain Kirk has been invited to be the first Federation representative to visit Gideon, but when he beams down, he finds himself alone inside an exact duplicate of the Enterprise, where he meets a woman named Odona.
Kirk learns that there is no pain or disease on the overpopulated Gideon, and Odona was placed in the simulation of the Enterprise so she could contract Vegan choriomeningitis from him, to introduce natural death to a planet where all life is valued and birth control is unacceptable. With the population growing, and life spans on Gideon increasing, introducing a deadly virus is the only natural way to decrease the population.
Factoid: With a germ-free atmosphere, Gideon was once a paradise before it became overpopulated.
Alien Races: *Gideons
Starships: [U.S.S. Enterprise NCC-1701]
KEY: [brackets]=illusions *star=first appearance