Well. No spoilers in my reviews... but .... well.
After last week's fuel debacle, the Robinson patriarchs arrive back at camp just in time to stop Victor blasting off with his family (in fairness, he's intending to send back help). Determining that Victor's ship wouldn't have enough fuel to make it to outer space anyway, Maureen comes up with a plan. Strip out everything from a ship that doesn't need to be there and blast off what remains, with a single pilot, and everything else monitored from the ground. Meanwhile, Judy tells the rest of her family that Dr Smith is not Dr Smith, so they lock her in a cupboard on their ship until they can make it back to the mothership, but is one of the family gullible enough to be talked into letting her out?
I actually kinda enjoyed this one. It dragged the focus back on to the family, and the interactions between them and Don West were fun. (Please don't push a relationship between Don and Judy though... still too much). I, believed in the science, sort of... even if I'm not convinced that being knocked out over and over again doesn't have a cumulative negative effect on someone.
The ending of the episode is a bit of an odd one, and I really can't see them going forward without retconning it somehow in the next episode (the episode title also suggests they might). But with the leash finally off for Dr.Smith and two episodes left, things are ramping up.