One Giant Leap centers on the culmination of the Titan launch preparations. Technical details are completed and interpersonal issues dealt on the eve of the six month mission. Jack and Allison consider a big step; Jo struggles with defining her own needs; Henry and Grace prepare to be apart; Fargo and Holly prepare to be together; and Parrish has an uncharacteristic play human moment. It is a very good episode, with more than a few surprises.
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