Infestation
Directed by Tim Southam
The opening is a flashback to Dr. Smith's past, revealing her real name: June Harris. Her sister, an accomplished businesswoman, offered to leave all her possessions to June as she left for Alpha Centauri. June, a petty criminal and family Black Sheep, drugged her and stole her identity, leaving her behind instead. We also learn throughout the episode that "Dr. Smith" murdered a crewman aboard the Resolute who recognized her, and was about to receive summary justice from the ship's captain when it was attacked.
Back in the present, while the storm rages outside, the Robinson family takes a much needed rest. John confronts Judy over her PTSD, offering help, but is rebuffed. Smith takes the opportunity to snoop on her rescuers, looking for ways to gain an advantage. Will has a nightmare about the Robot killing people. Something creepy is moving around outside the ship.
Then the glacier, destabilized by Penny's rash action in the previous episode, starts to collapse. It's now or never: they have to blast their way free, but the Jupiter's engines have been contaminated by the storm. As they rush to clean out the parts, a new emergency arises: the ship's fuel level is dropping rapidly. Smith plots to save herself (again), but the Robot, sensing imminent danger, locks Will in the storage closet along with her. John investigates the basement and is attacked by giant eels, which are revealed to be the cause of the fuel loss.
As Maureen races to repair the engines, John must go back into the basement to buy time. As the glacier continues to collapse, Penny is thrown into the water and Judy is trapped beneath a crate. Smith persuades Will to get the Robot to let her out, claiming it doesn't care about her. Instead of helping as promised, she straps into the ejection seat. Judy frees herself this time, overcoming her trauma. As Maureen struggles to put the last part back in place, Smith shows up, having changed her mind about escaping. The family crams into the cockpit, but the engines won't fire. Judy saves the day by dumping the remaining fuel supply, ejecting the eels that are blocking the fuel lines. The ship rockets free with barely enough fuel to land.
Their communications restored, the family is overjoyed to receive messages from other Jupiters and from the Resolute, demonstrating that they are no longer alone. John and Judy share a quiet bonding moment. In his cabin, the Robot offers Will a gun that it made on their 3D printer. Horrified, Will asks it why, and the Robot indicates that it is for Will's protection... against itself. Will tells the Robot never to hurt anyone and hides the gun. Smith sees him do it.
