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The Robinsons and Don are forced to convert the stranded Jupiter 2 into a sailing ship when the hull springs a leak, letting in poisonous atmosphere. Smith sets out to prove her usefulness, and Will misses the Robot.
Penny and Maureen are swept into the trench, and the Robinsons try to figure out a way to rescue them before the lightning storm hits. Meanwhile, Smith reads Penny's book and learns about Don's past.
Now stranded even deeper in space, the Robinsons band together to explore strange planets, face down new dangers and find their beloved Robot.