In a flashback, Dr. Smith is revealed to be June Harris, the older, ex-con sister of Jess Harris, a successful businesswoman. Jess offers June her entire estate as she is leaving Earth, but June drugs Jess and assumes her sister’s identity.
At night, the ice layer over the spaceship (Jupiter 2) cracks, endangering the ship. They rush to complete repairs, but the engines are losing fuel. When Will and the robot discover large eel-like creatures in the conduits, the robot locks Will, along with Smith, in the storeroom for safety.
Things almost descend to parody during struggles with a large eel. But at the end the ship is free of the ice and Dr Smith appears to be looking for a way out of her situation.
Comms pick up radio communication from other Jupiter survivors and also from Resolute, who are searching for survivors.