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In "Island in the Sky", the third episode of Lost in Space, the Jupiter 2 crashes on a planet, apparently named Priplanus. For the next few episodes, it's rather clear they have not made it back into space and reached another planet between episodes. In the next two episodes, we find out Priplanus has an eccentric orbit, causing the weather, periodically, to go from extreme cold to extreme heat. This is mentioned at some point later in the first season, so it's clear they were on Priplanus for most of that time.

In the first episode of the second season, "Blast Off into Space", the Robinson's leave a planet, but it's not clear if they're leaving Priplanus or if they've been on more than one planet since "Island in the Sky". Then, several episodes later, it seems, in "Forbidden World", the Jupiter 2 is once again stuck on a planet for most, if not all of the 2nd season, until they blast off in "Condemned of Space" (the first episode of the 3rd season). During the third season, they have a mix of space bound and planet bound episodes.

Overall, how many planets did the Jupiter 2 (or the Robinsons, using the Space Pod or other means) visit?

Is there any reason to believe that they left Priplanus during the first season and landed elsewhere, or that, after landing on a planet in the 2nd season, that they left it before "Condemned of Space"?

  • I'm not sure it's stated that they leave Priplanus before Blast Off into Space but they are pulled down to a new planet in The Ghost Planet but they must escape there because they are forced down to another planet in the very next episode Forbidden World. – Paulie_D Aug 26 '16 at 15:50
  • @Paulie_D: Thanks - yes, I missed that. I'll edit the question to include that. – Tango Aug 26 '16 at 16:18
  • Find a list of all 3rd season episodes by airdate. Assume that every time they blast off a planet and are seen on the ground in the next episode they have landed sometime between the episodes. Count up the 3rd season planets and add 3 for seasons 1 & 2. Then find out the order the 3rd season episodes were produced in and count all examples of blasting off in one episode and being on the ground in the next episode as examples of landing between episodes. Count up the 3rd season planets and add 3 for seasons 1 & 2 . If the numbers are different, chose the one you like best. – M. A. Golding Jan 10 '18 at 7:40
  • Here is a list of the production codes for lost in space episodes, which should correlate with their production order. iann.net/lis/episodes/index.htm – M. A. Golding Jan 10 '18 at 7:43
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    Having re-watched only half of the first season to-date (local TV station just started airing the series daily), all episodes since the landing in "Island in the Sky" must be on the same planet since nothing on-screen so much as hints at a successful departure from it - no depictions of a takeoff or landing, nothing in dialog or on-screen action. Since several episodes show tables of hydroponic or whatever farming, and dialog suggests attempts to repair/refuel the ship in preparation for an eventual flight, I'd say it's pretty much a given that the ship hasn't flown either on or off screen. – Anthony X Oct 14 '18 at 18:38
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I believe they blasted off from Priplanus in the Season 2 opener. Though there is no dialogue to support that, the rock formations around the Jupiter 2 are the same as the rock formations around it all through Season 1.

The Robinsons visited 2 planets in Season 2, the first being "The Ghost Planet" in episode 3 of Season 2 and then crash landing on "Forbidden World" in episode 4 of Season 2.

There were several planets in Season 3, which at times you'd see them leaving a planet in one episode and then the next they would already be encamped on another. So the number of planets in Season 3 would almost be theoretical.

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    So how many would that be in total 🤔 The asker is really looking for a definitive answer here. – Edlothiad Jul 30 '17 at 18:45
  • Find a list of all 3rd season episodes by airdate. Assume that every time they blast off a planet and are seen on the ground in the next episode they have landed sometime between the episodes. Count up the 3rd season planets and add 3 for seasons 1 & 2. Then find out the order the 3rd season episodes were produced in and count all examples of blasting off in one episode and being on the ground in the next episode as examples of landing between episodes. Count up the 3rd season planets and add 3 for seasons 1 & 2 . If the numbers are different, chose the one you like best. – M. A. Golding Jan 10 '18 at 7:37

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