When the announcement was made via the show's official Twitter back in March of 2020 that a third season of "Lost in Space" was on the horizon, it was accompanied by a message from showrunner Zack Estrin, reading, "From the beginning, we've always viewed this particular story of The Robinsons as a trilogy. A three part epic family adventure with a clear beginning, middle, and end." Knowing ahead of time that the third season would be the last definitely made the news quite bittersweet for fans.

Assuming no more than three seasons were ever in the works, it's good to see a show like "Lost in Space" end on its own terms rather than trying to squeeze more material out of the premise just for the sake of it. With the ending of Season 3 neatly completing the story, the show takes on the feel of a fully-formed, fantastic trilogy. But who knows, there may also be a spinoff on the horizon. Also, one of the show's stars, Mina Sundwell, expressed her ideas on what she'd like to see if Season 4 materialized.

Still, science fiction shows as smart and heartfelt as "Lost in Space" are increasingly rare these days, and fans are sad to see it go. So long, Will Robinson!