The astronaut family of Dr. John Robinson, accompanied by a pilot and a robot, set out in the year 1997 from an overpopulated Earth in the spaceship Jupiter 2 to travel to a planet circling the star Alpha Centauri. The Jupiter 2 mission is sabotaged by Dr. Zachary Smith (an agent for an unnamed foreign government) who slips aboard the spaceship and reprograms the robot to destroy the ship and crew. However, Smith is trapped aboard, and his excess weight alters the craft's flight path and places it directly in the path of a massive meteor storm.

Smith manages to save himself by prematurely reviving the crew from suspended animation. The ship survives, but the damage caused by Smith's earlier sabotage of the robot leaves the crew lost in space. The Jupiter 2 crash-lands on an alien world, later identified by Will as Priplanus, where they spend the rest of the season and survive a host of adventures. Smith remains with the crew and acts as a source of comedic cowardice and villainy, exploiting the eternally forgiving nature of Professor Robinson.
29 Episodes
  • The Reluctant Stowaway
    The Reluctant StowawayEpisode 1
  • The Derelict
    The DerelictEpisode 2
  • Island in the Sky
    Island in the SkyEpisode 3
  • There Were Giants in the Earth
    There Were Giants in the EarthEpisode 4
  • The Hungry Sea
    The Hungry SeaEpisode 5
  • Welcome Stranger
    Welcome StrangerEpisode 6
  • My Friend, Mr. Nobody
    My Friend, Mr. NobodyEpisode 7
  • Invaders from the Fifth Dimension
    Invaders from the Fifth DimensionEpisode 8
  • The Oasis
    The OasisEpisode 9
  • The Sky Is Falling
    The Sky Is FallingEpisode 10
  • Wish Upon a Star
    Wish Upon a StarEpisode 11
  • The Raft
    The RaftEpisode 12
  • One of Our Dogs Is Missing
    One of Our Dogs Is MissingEpisode 13
  • Attack of the Monster Plants
    Attack of the Monster PlantsEpisode 14
  • Return from Outer Space
    Return from Outer SpaceEpisode 15
  • The Keeper (1)
    The Keeper (1)Episode 16
  • The Keeper (2)
    The Keeper (2)Episode 17
  • The Sky Pirate
    The Sky PirateEpisode 18
  • Ghost in Space
    Ghost in SpaceEpisode 19
  • War of the Robots
    War of the RobotsEpisode 20
  • The Magic Mirror
    The Magic MirrorEpisode 21
  • The Challenge
    The ChallengeEpisode 22
  • The Space Trader
    The Space TraderEpisode 23
  • His Majesty Smith
    His Majesty SmithEpisode 24
  • The Space Croppers
    The Space CroppersEpisode 25
  • All That Glitters
    All That GlittersEpisode 26
  • The Lost Civilization
    The Lost CivilizationEpisode 27
  • A Change of Space
    A Change of SpaceEpisode 28
  • Follow the Leader
    Follow the LeaderEpisode 29
Cast of Season 1
  • Guy WilliamsDr. John Robinson
  • June LockhartDr. Maureen Robinson
  • Mark GoddardMajor Don West
  • Marta KristenJudy Robinson
  • Angela CartwrightPenny Robinson
  • Bill MumyWill Robinson
  • Jonathan HarrisDr. Zachary Smith
  • Dick TufeldRobot B-9
  • Bob MayRobot B-9

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