Selfish Doctor [Spoilers]
When they're forced to whittle down the crew, the aged & barely able to survive the liftoff doctor chooses himself as 1 that should survive. His sperm count is probably low and if he survives the landing on the planet to father any children, we wont live to raise them. Also, due to his condition, energy will be spent tending to his needs as he ages and gets enfeebled
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