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The Worst Episodes of Lost in Space

Every episode of Lost in Space ranked from worst to best. Explore the Worst Episodes of Lost in Space!

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The space family Robinson is sent on a five-year mission to find a new planet to colonise. The voyage is sabotaged time and again by an inept stowaway, Dr. Zachary Smith. The family's spaceship, Jupiter

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  1. #1 Worst Episode
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    Lost in Space Season 2 Episode 19 - Mutiny in Space
    4.6/10(238 votes)

    #1 - Mutiny in Space

    S2:E19

    Dr. Smith's finds an alien ship and wants to use it to get back to earth, but he doesn't count for the owner of the ship admiral zahik to turn up and wreck his plans.

    Director:Don Richardson
    Writer:Peter Packer

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  2. Lost in Space Season 2 Episode 17 - The Questing Beast
    4.8/10(279 votes)

    #2 - The Questing Beast

    S2:E17

    Will and Dr Smith are confronted by a knight, who says he is on a quest to seek out and destroy the beast Gundemar. Penny, meanwhile, meets Gundemar and befriends her. Will becomes the pageboy of the knight. When it is discovered that the beast is woman, the knight is unsure whether he can still kill it, leading him to question his life's future.

    Director:Don Richardson
    Writer:Carey Wilber

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  3. Lost in Space Season 2 Episode 20 - The Space Vikings
    4.8/10(242 votes)

    #3 - The Space Vikings

    S2:E20

    A storm looms up and the two gloves of Thor appear from space and straight into the waiting hands of Dr. Smith. Then are then taken away to see the real Thor who will decide there fate.

    Director:Ezra Stone
    Writer:Margaret Brookman Hill

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  4. Lost in Space Season 3 Episode 23 - The Great Vegetable Rebellion
    5.1/10(295 votes)

    #4 - The Great Vegetable Rebellion

    S3:E23

    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 life, and some of them are quite intelligent. One of these plants, a large carrot, captures Smith and tries to change him into a plant. The Jupiter II lands and the Robinsons and West come to Smith's rescue, only to be captured themselves. Eventually they thwart the plant creature and make their escape.

    Director:Don Richardson
    Writer:Peter Packer

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  5. Lost in Space Season 3 Episode 14 - Castles in Space
    5.3/10(225 votes)

    #5 - Castles in Space

    S3:E14

    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 with a idea to save the day.

    Director:Sobey Martin
    Writer:Peter Packer

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  6. Lost in Space Season 3 Episode 17 - Princess of Space
    5.5/10(218 votes)

    #6 - Princess of Space

    S3:E17

    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 the train Penny to be the future ruler of there planet.

    Director:Don Richardson
    Writer:Jackson Gillis

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  7. Lost in Space Season 2 Episode 16 - The Girl From the Green Dimension
    5.6/10(259 votes)

    #7 - The Girl From the Green Dimension

    S2:E16

    Athena the girl from the green dimension who hypnotised Dr Smith during thier space flight arrives on the planet. She still is in love with Dr Smith, which he uses to bribe her to help him see the future. However, he promises to go back to the green dimension with him, and when Athena's previous suitor arrives and turns Will green, Dr Smith must find a way to save himself and Will. Urso, Athena's suitor challenges Dr Smith for the lady, customary in the Green Dimension, and after seeing the future, Dr Smith fears the worst. Athena realises he cannot be with her, and leaves with Urso, but not before Urso restores Will's colour.

    Director:Nathan Juran
    Writer:Peter Packer

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  8. Lost in Space Season 2 Episode 18 - The Toymaker
    5.7/10(242 votes)

    #8 - The Toymaker

    S2:E18

    Dr Smith discovers another Android Machine, in the middle of a dangerous fisher. When he tries to order something, he is trapped inside the machine. Later when Will tries to get him out, he too is sucked in. Zumdish arrives on the planet in order to destroy the faulty, forgotten machine. Meanwhile Will and Dr Smith discover the magical Toymaker's world, as they are mistekn for toys. They later discover they are close to earth. Will they return to Earth, be blown up, or Will Professor Robinson and the Robot be able to save them.

    Director:Robert Douglas
    Writers:Wanda Duncan, Bob Duncan

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  9. Lost in Space Season 3 Episode 21 - Space Beauty
    5.7/10(221 votes)

    #9 - Space Beauty

    S3:E21

    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 name and the fun begins.

    Director:Irving J. Moore
    Writer:Jackson Gillis

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  10. Lost in Space Season 2 Episode 21 - Rocket to Earth
    5.8/10(226 votes)

    #10 - Rocket to Earth

    S2:E21

    The crew are outside playing ball when a magician called Zalto. Dr. Smith uses Zalto to conjure up a space ship so he can use it to get back to earth.

    Director:Don Richardson
    Writer:Barney Slater

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  11. Lost in Space Season 3 Episode 9 - Collision of Planets
    5.8/10(236 votes)

    #11 - Collision of Planets

    S3:E9

    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 they will all be doomed.

    Director:Don Richardson
    Writer:Peter Packer

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  12. Lost in Space Season 3 Episode 12 - A Day at the Zoo
    5.8/10(227 votes)

    #12 - A Day at the Zoo

    S3:E12

    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, meanwhile Dr. Smith tries to take over the zoo.

    Director:Irving J. Moore
    Writer:Jackson Gillis

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  13. Lost in Space Season 3 Episode 13 - Two Weeks in Space
    5.8/10(222 votes)

    #13 - Two Weeks in Space

    S3:E13

    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 clients. The Robinson's head off and Dr. Smith is left alone, Smith's decides to turn the ship into a hotel and doesn't realize how dangerous his guests are.

    Director:Don Richardson
    Writer:Robert Hamner

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  14. Lost in Space Season 3 Episode 24 - Junkyard in Space
    5.8/10(227 votes)

    #14 - Junkyard in Space

    S3:E24

    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.Smith be stopped?

    Director:Ezra Stone
    Writer:Barney Slater

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  15. Lost in Space Season 2 Episode 11 - West of Mars
    5.9/10(253 votes)

    #15 - West of Mars

    S2:E11

    Dr Smith is confronted by an identical look-alike called Zeno, who is on the run from the law. Zeno makes him trade places and Dr Smith, out of fear confesses to Zeno's crimes. He is arrested and he and Will taken away to appear in court. Will the real Zeno be caught before Dr Smith is boiled in oil?

    Director:Nathan Juran
    Writer:Michael Fessier

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  16. Lost in Space Season 2 Episode 9 - The Thief from Outer Space
    6.1/10(252 votes)

    #16 - The Thief from Outer Space

    S2:E9

    A person know as ' the thief from outer space' appears in a puff of smoke, will agrees help help him rescue a princess who was lost more than 200 years ago by evil vizier.

    Director:Sobey Martin
    Writer:Jackson Gillis

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  17. Lost in Space Season 2 Episode 10 - The Curse of Cousin Smith
    6.1/10(252 votes)

    #17 - The Curse of Cousin Smith

    S2:E10

    When Dr Smith's cousin Jeremiah Smith arrives on the planet, everyone welcomes him, except Dr Smith. Dr Smith alienates himself from the family, and refuses to return until his cousin leaves. It is later discovered that Jeremiah's reaosns for being on the planet are far deadlier than anyone imagined.

    Director:Jus Addiss
    Writer:Barney Slater

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  18. Lost in Space Season 2 Episode 5 - Space Circus
    6.2/10(252 votes)

    #18 - Space Circus

    S2:E5

    The Space Family Robinson go through a food crisis when their plant purifier breaks down. Will and Dr Smith discover a travelling show of circus people, and Will is later tricked in to agreeing to join. It's a race against time for the Robinsons to save will, and keep themselves alive.

    Director:Harry Harris
    Writers:Wanda Duncan, Bob Duncan

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  19. Lost in Space Season 2 Episode 23 - Treasure of the Lost Planet
    6.2/10(215 votes)

    #19 - Treasure of the Lost Planet

    S2:E23

    Alonzo P. Tucker returns, this time more in keeping with the pirate character he tried to create in his first appearance. This time Tucker is searching for Billy Bones' treasure, and is using the head of Billy Bones, which is kept in a box, to help him find it. He has three cutthroats with him, and he has to find the treasure and keep the cutthroats from endangering the Robinsons. Tucker's robotic bird is back again, and continues to torment the robot.

    Director:Harry Harris
    Writer:Carey Wilber

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  20. Lost in Space Season 3 Episode 22 - The Flaming Planet
    6.2/10(191 votes)

    #20 - The Flaming Planet

    S3:E22

    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, meanwhile the ship is attached by a brave space warrior.

    Director:Don Richardson
    Writer:Barney Slater

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  21. Lost in Space Season 3 Episode 7 - The Haunted Lighthouse
    6.3/10(243 votes)

    #21 - The Haunted Lighthouse

    S3:E7

    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 an earth ""lighthouse"" for lost ships. Thinking this ship will help them with extra fuel and star charts they celebrate, however when J-5 learns that they don't have enough fuel to take him home, he angrily sets about to destroy them all with a creation of his imagination. J-5 begins a new life at the lighthouse, and the Robinson's leave in the knowledge he will be looked after by the kindly, old lighthousekeeper.

    Director:Sobey Martin
    Writer:Jackson Gillis

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  22. Lost in Space Season 2 Episode 8 - The Deadly Games of Gamma 6
    6.4/10(238 votes)

    #22 - The Deadly Games of Gamma 6

    S2:E8

    When a troope of Galactic Gladiators arrive on the planet, they challenge Professor Robinson to a duel, which will be aired all of the galaxy. John declines saying he isn't interested in physical combat. Dr Smith takes up the offer when he makes a deal that if he wins, he will be returned to Earth. Unbeknownst to him, if he loses, which is a near-certanty, Earth will be destroyed.

    Directors:Nathan Juran, Harry Harris
    Writer:Barney Slater

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  23. Lost in Space Season 2 Episode 29 - The Astral Traveler
    6.4/10(220 votes)

    #23 - The Astral Traveler

    S2:E29

    Dr Smith and Will become trapped in a cave during a cosmic storm. Will is accidently pulled through a cosmic time warp, and ends up on Earth, in Scottish castle. He meets a headless ghost called Hamish who was beheaded at the Castle. Hamish is trapped there due to the callous crimes he has committed. They rest of the family manage to get Will out, but Hamish follows him. They decide to re-create the time warp, and send Hamish home, and with him Dr Smith, carrying star-charts and maps so that he may send a rescue mission to save the Robinsons. Upon re-entering the warp, Dr Smith drops the charts, and Will runs after him to give them to him. They are both taken. When they reach the castle again, Dr Smith and Will realise that they are not in their time. Also, Hamish becomes angry when he realises that Dr Smith is a liar, and has no intention of helping the Robinsons. As an act of reveng he sets out to destroy Dr Smith. In the end, Will and Dr Smith return to the planet, and Ha

    Director:Don Richardson
    Writer:Carey Wilber

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  24. Lost in Space Season 3 Episode 5 - The Space Primevals
    6.4/10(208 votes)

    #24 - The Space Primevals

    S3:E5

    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 episode also features a temporary camaraderie between Don and Smith, a burying of the hatchet, when Don is rescued by Smith from a pit, and then says ""Doctor Smith"" - using the word Doctor for the first time unknown ages. However, their camaraderie dissolves and the characters are back to ""normal"". Not the first time Smith has become selfless and a man of some integrity, but as usual, Smith returns to normal.

    Director:Nathan Juran
    Writer:Peter Packer

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  25. Lost in Space Season 3 Episode 11 - Deadliest of the Species
    6.4/10(204 votes)

    #25 - Deadliest of the Species

    S3:E11

    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 meets and falls in love with this evil, female Robot. She tries to turn the Robot bad, but ultimately, is defeated by the Robot and the Robinsons, but not before wreaking havoc over the planet.

    Director:Don Richardson
    Writer:Robert Hamner

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Worst Episodes Summary

"Mutiny in Space" is the worst rated episode of "Lost in Space". It scored 4.6/10 based on 238 votes. Directed by Don Richardson and written by Peter Packer, it aired on 2/1/1967. This episode scored 0.2 points lower than the second lowest rated, "The Questing Beast".