Lost in Space: Season 3
Season 3 Lore Primer
Key plot threads, lore context, and character stakes you need to remember before diving into this season.
- Directly follows the overarching narrative developments of Lost in Space Season 2.
- Faction dynamics and core character alliances shift under escalating external stakes.
- Crucial mysteries introduced previously reach key turning points and narrative reckonings.
- Sets up serialized story arcs that build directly toward the climactic season finale.
Episode Guide
Season 3 Progress Shield
Condemned of Space
Sep 6, 1967
The beginning of the third season finds the Robinsons having to quickly leave the planet they are on, which is a similar plot to the beginning of the second season. Once in space,
Visit to a Hostile Planet
Sep 13, 1967
The Jupiter 2 and all aboard are caught in a space 'time-warp'! After everything seems to return to normal, they're shocked to find Earth within their reach and decide to return h
Kidnapped in Space
Sep 9, 1967
Dr. Smith answers a distress call from an alien space ship. He arrives there using the Space Pod, and discovers that the aliens want him to operate on (actually, repair), their le
Hunter's Moon
Sep 27, 1967
In an episode reminiscent of the first season episode "The Challenge", Professor Robinson and the Robot land the Space Pod on a planet, and Professor Robinson kills an attacking mo
The Space Primevals
Oct 4, 1967
The primitive beings are actually wards of a computer, Protinius, which can confer temporary advanced sentience on the leading man in order to communicate Protinius' will. The epi
Space Destructors
Oct 11, 1967
Dr. Smith and the Robot are exploring a cave. Smith pushes several buttons on a conspicuous control panel. The buttons activate a cyborg creating device. It up to Will to stop Dr.
The Haunted Lighthouse
Oct 18, 1967
Before leaving their planet, the Robinsons meet a boy alien called J-5. They take him with them to return him to his home planet. They meet a strange ship, which turns out to be
Flight into the Future
Oct 25, 1967
Dr. Smith, Will, and the Robot are accidentally launched in the Space Pod. They land on a planet that is controlled by an alien machine that creates illusions to confuse visitors
Collision of Planets
Nov 8, 1967
The Robinson's come across a group of space hippies who are trying to destroy the planet the Robinson's currently inhabit. Up up to the Robinson's and Dr. Smith to stop them or the
Space Creature
Nov 15, 1967
A strange blue fog seems to be engulfing the Jupiter 2 periodically. Dr Smith and Will commment seperately that they want to be left alone. When the members of the Jupiter 2 begin
Deadliest of the Species
Nov 22, 1967
The Robinsons encounter two Aliens who are on a mission to seek and destroy an escaped Robot Prisoner, whom they believe to be hiding at the Jupiter Two. Meanwhile, the Robot meet
A Day at the Zoo
Nov 29, 1967
A caveboy appears and attempts to lure Penny away, but she refuses, and is instead caught in a net. She is transported to an intergalactic zoo, were she will be puton show, meanwhi
Two Weeks in Space
Dec 13, 1967
Two aliens, who are actually intergalactic bank robbers, transform themselves into Earthlings. They revive a man named Zumdish who operates a tour agency and they pretend to be his
Castles in Space
Dec 20, 1967
The Robinsons take in a Princess who is fleeing from a bounty hunter. Will is captured by the bounty hunter, who wants to trade the boy for the princess. the robot then comes up wi
The Anti-Matter Man
Dec 27, 1967
Professor Robinson is caught in a matter transfer emission ray, and subsequently ends up in another dimension where he is confronted by a version of himself and Don. However this
Target: Earth
Jan 3, 1968
The Space Pod lands on a planet that is inhabited by creatures who all look alike, and aspire to be different. They capture the Robinsons and make duplicates of them with the obje
Princess of Space
Jan 10, 1968
A crew led by Captain Kraspo is searching for the missing Princess Alpha. They bring Will aboard their ship who makes them think the Penny might be there princess, because of this
Time Merchant
Jan 17, 1968
Will is conducting an experiment in a cave and captures a man who claims to be the man who controls time for the entire universe. This ""Time Merchant"" takes Will, Professor Robi
The Promised Planet
Jan 24, 1968
The Robot suddenly announces that the Jupiter II is approaching Alpha Centauri. Everyone is suprised, and the ship lands on a planet, where they are greeted by a group of people w
Fugitives in Space
Jan 31, 1968
Poor Don West is sent to a prison camp.....WITH Dr. Smith! Don and Dr Smith are installing some equiptment, when Dr Smith comes across and alien prison escapee. The priosoner alie
Space Beauty
Feb 14, 1968
The galactic showman, Farnum B returns as the producer of the Miss Galaxy Beauty Pageant. They want to Judy to be in the contest, she doesn't want to but Dr. Smith for forges her
The Flaming Planet
Feb 21, 1968
Dr. Smith disposes of a plant that has grown out of control, but once outside the plant attaches itself to the Jupiter 2. The plant apparently believe that Dr. Smith is its mother,
The Great Vegetable Rebellion
Feb 28, 1968
Doctor Smith uses the Space Pod to land on a planet that the Jupiter II is passing by. It turns out that the planet has evolved in such a way that plants are the highest form of l
Junkyard in Space
Mar 6, 1968
The Jupiter 2 lands on a planet which serves as a junkyard. The Robinson's food supply is dwindling. So Dr. Smith tries to sell the robot and the ship in order to get food. Can Dr.