Another really good episode as we approach the finale of the show. It does include an idea that the show has used before but generally it figured out some of the questions I've had recently and leads us into a tense finale.
Reunited, the extended Robinson family discuss the actions of the last few hours whilst trying to get their Jupiter operational again. Realising that SAR scanned Don (Ignacio Serricchio) which would give him the location of Alpha Centuri, the Robinsons aim to hasten their departure but Will (Maxwell Jenkins) has another plan and goes to meet SAR directly.
Shorn of the need for flashbacks as it ramps up towards the end this episode is framed somewhat by the "goodbye" messages that Will has been leaving. Intended to show his departure to his secret mission, they take an even darker turn when his meeting with SAR goes badly. We also learn that SAR is behind the death of his creators, although the specifics of that aren't really given.
Again, there is still work for the series to do to nail the landing, but in terms of increasing the tension this episode certainly ends on a high.