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Episode 16 “Fever”

Martha, who has been hiding the key to the spaceship, becomes extremely sick from inhaling the dust of green meteor rock that was underground. The Kent farm is quarantined, and the key discovered. Clark, who inhaled the meteor dust as well, falls sick too. While Clark is unconscious, Chloe reads him a note describing her true feelings for him, only to have him mumble Lana’s name in his sleep. After testing his blood, Dr. Helen Bryce realizes that Clark is different. Martha is revealed to be pregnant after the ship removes her poisoning.