Season 1
Episode: 1x01 | Airdate: Sep 15, 1965
As the Jupiter 2 prepares to launch, Colonel Dr. Smith comes on board and ends up being trapped onboard during blastoff. Because of him being there, the Jupiter 2 careens off course and becomes lost in space.
Episode: 1x02 | Airdate: Sep 22, 1965
The Jupiter 2 is pulled into a giant ship occupied by bubble-like creatures.
Episode: 1x03 | Airdate: Sep 29, 1965
While spacewalking Doctor Robinson is pulled down onto a planet. Major West lands the ship to search for him.
Episode: 1x04 | Airdate: Oct 6, 1965
Due to the planet's orbit, the Robinsons are going to freeze to death unless they head south.
Episode: 1x05 | Airdate: Oct 13, 1965
After experiencing the extreme cold, the planet gets closer to the sun, roasting it. Smith sends the robot to warn the Robinsons.
Episode: 1x06 | Airdate: Oct 20, 1965
The Robinsons meet a fellow Earth explorer who is also lost in space. They help him repair his ship and ask him to take Will and Penny home.
Episode: 1x07 | Airdate: Oct 27, 1965
Penny strikes up a friendship with a deep voice in a deep cave.
Episode: 1x08 | Airdate: Nov 3, 1965
Macabre aliens -- quite literally talking heads -- need a humanoid brain to replace a worn out computer in their spaceship. They capture Smith, but quickly realize that his brain is unsatisfactory. The aliens release Smith so that he can bring them somebody more suitable: "a small Robinson."
Episode: 1x09 | Airdate: Nov 10, 1965
The Robinsons face dangers on strange terrain, where water is running low and the heat is getting more intense.
Episode: 1x10 | Airdate: Nov 17, 1965
A small, crab-like robot heralds the arrival of a family of colonists from an alien race called the Taurons. John believes that they are peaceful settlers, but Smith insists that they are the vanguard of an invading army.
Episode: 1x11 | Airdate: Nov 24, 1965
Will and Dr. Smith come upon an alien machine that grants wishes, which tests the values of the Robinson group.
Episode: 1x12 | Airdate: Dec 1, 1965
Will's "message-in-a-bottle" experiments deplete the supply of fuel for the Jupiter 2. John and Don work on an alternate fuel source, but they cannot stabilize the output. Deciding to build a smaller, 2-man craft, they pull the reactor chamber out and use Will's experiments to construct a "space raft."
Episode: 1x13 | Airdate: Dec 8, 1965
With the men off on a mission, the Robinson women must deal with an alien intruder.
Episode: 1x14 | Airdate: Dec 15, 1965
Banished from camp for his latest endangering behavior, Dr. Smith discovers alien plants that can duplicate things (including people), which he uses to his advantage.
Episode: 1x15 | Airdate: Dec 29, 1965
Using a matter transfer device left behind by the Taurons, Will beams himself back to Earth. He arrives safely in the small town of Hatfield Four Corners, Vermont, but his pleas for help are considered the fantasies of a runaway boy.
Episode: 1x16 | Airdate: Jan 12, 1966
The Keeper is an alien who travels the galaxy collecting living pairs of interesting or rare animals. His courtly overtures towards the Robinsons belie his true intention -- to add a pair of humans to his incredible menagerie.
Episode: 1x17 | Airdate: Jan 19, 1966
Troubles with The Keeper would be over if Dr. Smith hadn't skulked aboard his ship and released all the animals, putting The Keeper in a position to blackmail the Robinsons for their children
Episode: 1x18 | Airdate: Jan 26, 1966
Will becomes fast friends with Captain Alonzo P. Tucker, an Earthling who escaped his alien captors to become a wandering space buccaneer. But Tucker's roguish charm hides a secret that could destroy them all.
Episode: 1x19 | Airdate: Feb 2, 1966
Trying to contact his Uncle Thaddeus during a séance, Doctor Smith summons a ghostly monster native to the planet.
Episode: 1x20 | Airdate: Feb 9, 1966
After the Robinsons repair a damaged robot, it first helps them and then plots to capture them.
Episode: 1x21 | Airdate: Feb 16, 1966
During a cosmic storm, Dr. Smith and Penny discover a strange mirror. Dr. Smith becomes interested in the mirror because it has platinum in it. Meanwhile Penny gets very emotional and wants to stay the way she is when Judy tells her she should dress feminine once in a while. Later Debbie the Bloop is followed into the strange mirror where a pocket universe with a odd boy is discovered.
Episode: 1x22 | Airdate: Mar 2, 1966
John and Will fight a battle with an alien father and son that is to the death.
Episode: 1x23 | Airdate: Mar 9, 1966
After ruining the Robinson's food supply, Doctor Smith makes a deal with the space trader and gives his body for food provided he collects it in 200 years. The space trader comes to collect immediately.
Episode: 1x24 | Airdate: Mar 16, 1966
Doctor Smith delights that he is made ruler of an alien species until he learns that he is also their sacrifice.
Episode: 1x25 | Airdate: Mar 30, 1966
The Robinsons run into a group of space hillbillies whom Zachary believes might take him back to Earth.
Episode: 1x26 | Airdate: Apr 6, 1966
Dr. Smith and Penny obtain a ring that will turn anything to platinum.
Episode: 1x27 | Airdate: Apr 13, 1966
Will awakes a sleeping princess whom he now must marry. Her race has been awakened and now plans to conquer the universe starting with Earth.
Episode: 1x28 | Airdate: Apr 20, 1966
A strange interdimensional ship turns Will into a genius and Dr. Smith into an old man.
Episode: 1x29 | Airdate: Apr 27, 1966
An evil spirit possesses John Robinson and plans to fly the Jupiter 2 back to his home world, even at the expense of Will's life.
Season 2
Episode: 2x01 | Airdate: Sep 14, 1966
Dr Smith and Will befriend an old miner named Nerim. After a series of earthquakes indicates that the planet is breaking up, Dr Smith tries to convince them that it is merely the effects of mining, and no harm will come to the planet. John informs him that he is wrong and that the Robinson family will be departing within the day. It is a race against time to escape the crumbling planet.
Episode: 2x02 | Airdate: Sep 21, 1966
Shortly after leaving their original crash-site planet, Smith spots a familiar star and, in an amazing show of stellar navigational skill, calculates the course to get back to Earth. He extracts a promise from Don and John that they'll return to Earth, or else he'll destroy his navigation data. They agree, but inform the family at dinnertime that they are headed for Alpha Centauri after all, mainly because the Earth is on the other side of the Sun (how do they know that? - do they know the date? And besides, from Alpha Centauri, Earth revolves clockwise, visible all the time). Smith changes course 180 degrees, then clumsily jettisons most of the fuel. They reach a refueling barge, one of several that Alpha Control put out in 1996, top up the tanks, and resume course for Alpha Centauri, not knowing that they've picked up a tailgater who follows them after Smith reverses course to Earth again. The alarm goes off in the night, and they expend a lot of fuel pulling away from the Earth's
Episode: 2x03 | Airdate: Sep 28, 1966
Due to Smith's actions the crew has had to land their ship on an alien planet which is run by cyborgs. Meanwhile the crew try to break free from the captors who promise them power and luxury and they have to save their robot who was crippled by a ray gun.
Episode: 2x04 | Airdate: Oct 5, 1966
The Robinsons encounter a hermit who plans to attack the Jupiter 2 with his army.
Episode: 2x05 | Airdate: Oct 12, 1966
A space circus comes to town and the owner wants Will to run away with it.
Episode: 2x06 | Airdate: Oct 19, 1966
The Robinsons are tried for space crimes and the evidence shows that Smith is really responsible for the mishaps.
Episode: 2x07 | Airdate: Oct 26, 1966
Doctor Smith creates an android that they teach to be more human. A humanoid shows up looking for payment for the android.
Episode: 2x08 | Airdate: Nov 2, 1966
Dr. Smith ends up in a boxing match with some space gladiators. If he wins he will return to Earth, and if he loses it won't matter because Earth won't be there.
Episode: 2x09 | Airdate: Nov 9, 1966
Will, Penny and Dr. Smith get involved with a thief that is searching for a princess
Episode: 2x10 | Airdate: Nov 16, 1966
Jeremiah Smith shows up to kill Doctor Smith for his inheritance.
Episode: 2x11 | Airdate: Nov 30, 1966
Will and Doctor Smith are out and about and a swift gun named Xeno who is on the run from the law and happens to be a exact double for Dr. Smith trades places with him allowing the real Dr. Smith to be arrested in his place.
Episode: 2x12 | Airdate: Dec 7, 1966
Doctor Smith while out with Will discovers a golden Lyre on a pedestal in a stone arch. He strums it and is sent to what appears to be Hell.
Episode: 2x13 | Airdate: Dec 14, 1966
The mysterious Saticon's make a offer to the Robinsons to buy the robot. The offer is turned down and then in the middle of the night the robot disappears. Later it is discovered that the Saticon's are more than they seem.
Episode: 2x14 | Airdate: Dec 21, 1966
Sesmar cons Doctor Smith into using a special camera to take pictures of the Robinsons. They're personalities are then stolen from them for use in a Frankenstein type android that Sesmar is in the process of creating.
Episode: 2x15 | Airdate: Dec 28, 1966
Beauty meets the beast, two aliens fighting a war land on the planet and the Robinsons are stuck in the middle of things. Handsome golden man Keema and the frog faced alien have the Robinson's choosing sides, will it be the right one?
Episode: 2x16 | Airdate: Jan 4, 1967
Athena, the green girl from "Wild Adventure" who lured Doctor Smith out into space, returns and is still in love with him. Her suitor from the Green dimension follows her and turns Will green.
Episode: 2x17 | Airdate: Jan 11, 1967
Sagramonte a knight errant, comes to the planet in search of Gundemar The Questing Beast. He then takes Dr. Smith and Will hostage.
Episode: 2x18 | Airdate: Jan 25, 1967
Doctor Smith and Will discover a old android machine from the Celestial Department store and end up getting sucked into the machine. There they meet a toymaker who refuses to believe that they are both human.
Episode: 2x19 | Airdate: Feb 1, 1967
A space pirate looking for his crew that mutinied finds Will and Dr. Smith trying to repair his empty ship.
Episode: 2x20 | Airdate: Feb 8, 1967
Through some harmless playacting, Dr. Smith unintentionally conjures up the magical gauntlets and war hammer of the Norse god Thor. Taking him for a mighty warrior, Brynhilda spirits Smith off to Asgard for a showdown with Thor.
Episode: 2x21 | Airdate: Feb 15, 1967
Smith is keen for the job of sorcerer's apprentice after learning that a space magician's rocket ship can reach Earth in a few hours.
Episode: 2x22 | Airdate: Feb 22, 1967
Shortly before lift-off, Dr. Smith discovers a cave inhabited by devices, which are the remnants of a once-mighty civilization; the Draconians. As the countdown draws near, Dr. Smith falls ever-more-so under the influence of the Draconians.
Episode: 2x23 | Airdate: Mar 1, 1967
Dr. Smith, Penny and Will are out playing a game and Penny finds a gold coin on the game board. They then find a trail of the gold coins and Dr. Smith falls into a cave containing a skeleton of an alien along with a old treasure chest. The Robinsons then have another encounter with the notorious space pirate Captain Tucker.
Episode: 2x24 | Airdate: Mar 8, 1967
In the second of two sequels to Lost in Space: The Android Machine (1966), Verda's sheltered by the Robinsons after she's marked for destruction by the Celestial Department Store. To that end, the store dispatches a killer android: IDAK (Instant Destroyer And Killer).
Episode: 2x25 | Airdate: Mar 15, 1967
A female alien meets the Robinsons and uses them to help erect an arch to bring her people to colonize the Robinsons' planet.
Episode: 2x26 | Airdate: Mar 22, 1967
While in the Valley of Shadows the Robot is affected by strange forces and grows to the size of a building. Will and Dr. Smith enter the Robot to try to reverse the process and save him.
Episode: 2x27 | Airdate: Mar 29, 1967
While John and Maureen are away observing volcanic activity, the alien scientist Lemnoc captures Don, Judy, Penny, and Dr. Smith and replaces them with android duplicates. Lemnoc then forces Will and the Robot to train the duplicates in survival skills, hoping that they will be an inspiration to his own people, who are losing the will to live.
Episode: 2x28 | Airdate: Apr 5, 1967
The planet is invaded by an army of tiny robots who closely resemble the Robinsons' Robot and proclaim him as their long-predicted king. The Robot agrees to become their king, but when he is not the ruthless ruler they expected, they decide that he needs some "Dr. Smith" in him.
Episode: 2x29 | Airdate: Apr 12, 1967
Will and Dr. Smith find a cave that transports them to Earth, 19th-century Scotland.
Episode: 2x30 | Airdate: Apr 26, 1967
Penny will not give up the belt entrusted to her by an alien even if it means their deaths
Season 3
Episode: 3x01 | Airdate: Sep 6, 1967
The Robinsons leave their planet to escape a collision with a comet and find a ship full of frozen convicts.
Episode: 3x02 | Airdate: Sep 13, 1967
Passing through a time warp, the Robinsons do return to Earth in the year 1947. They are mistaken as invaders and start the UFO scare of the 194
Episode: 3x03 | Airdate: Sep 20, 1967
A spaceship requests medical help for their computer and Dr. Smith has to perform brain surgery on it.
Episode: 3x04 | Airdate: Sep 27, 1967
After killing a hostile alien, Professor Robinson comes across a "hunter" and he must replace his dead prey.
Episode: 3x05 | Airdate: Oct 4, 1967
On a planet where a primitive people are ruled by a computer, Doctor Smith goes against character and saves Major West's life.
Episode: 3x06 | Airdate: Oct 11, 1967
Using an alien machine Doctor Smith creates an army of cyborgs to conquer the universe.
Episode: 3x07 | Airdate: Oct 18, 1967
The Robinsons take a boy home to his planet and come across a spaceship that is a space lighthouse. The boy gets angry when they tell him they don't have enough fuel to get him home.
Episode: 3x08 | Airdate: Oct 25, 1967
Accidentally landing on a planet, Will, Doctor Smith and the Robot find the Jupiter 2 is now an archaeological site and that they are in the future.
Episode: 3x09 | Airdate: Nov 8, 1967
A group of space hippies is going to destroy the planet the Robinsons are on.
Episode: 3x10 | Airdate: Nov 15, 1967
When a gaseous creature engulfs the Jupiter 2, the other crew members disappear leaving Will and Doctor Smith alone.
Episode: 3x11 | Airdate: Nov 22, 1967
The Robot "falls in love" with an evil female robot sought by two aliens.
Episode: 3x12 | Airdate: Nov 29, 1967
Galaxic showman Farnum B. wants to exhibit the Robinsons in his zoo.
Episode: 3x13 | Airdate: Dec 13, 1967
Two escaped thieves transform themselves into humans and pretend to be tourists as Smith turns the Jupiter 2 into a hotel.
Episode: 3x14 | Airdate: Dec 20, 1967
Will meets a princess who is escaping two bounty hunters, yet Will gets kidnapped instead.
Episode: 3x15 | Airdate: Dec 27, 1967
John Robinson and Don West are transported onto a strange new world where their evil opposites exist and plan to change places with them. Will, the Robot and a reluctant Dr. Smith set out to find and help the real Don and John only to be pursued by an evil John Robinson.
Episode: 3x16 | Airdate: Jan 3, 1968
Landing on a planet some shapeless beings duplicate the Robinsons and take the Jupiter 2 with the intent of conquering Earth. Will gets aboard to stop them.
Episode: 3x17 | Airdate: Jan 10, 1968
Penny is kidnapped by aliens who think that she is the missing Princess Alpha.
Episode: 3x18 | Airdate: Jan 17, 1968
After making a deal with the Time Merchant, Dr. Smith returns to Earth just before the launch of the Jupiter II. If he doesn't get on it, the Jupiter II will crash into an asteroid.
Episode: 3x19 | Airdate: Jan 24, 1968
When the Robinsons nearly reach Alpha Centauri, they find a human base run by young people. They convince the adults that Penny and Will aren't their children and they leave in the Jupiter 2.
Episode: 3x20 | Airdate: Jan 31, 1968
Don and Doctor Smith are sent to an intergalactic prison after coming across an escapee.
Episode: 3x21 | Airdate: Feb 14, 1968
Farnum B, the intergalactic showman, again encounters the Robinsons as he presents the Galaxy Beauty Pageant, and its sponsor wants Judy to enter - and win.
Episode: 3x22 | Airdate: Feb 21, 1968
Doctor Smith disposes of a plant which has grown to an intense size, and becomes attached to the hull of the Jupiter 2.
Episode: 3x23 | Airdate: Feb 28, 1968
Smith lands the pod on a planet where plants are the highest form of intelligence. The Robinsons land only to be captured by Tybo, a giant carrot. He plans to turn them into trees while Dr. Smith becomes a stalk of celery.
Episode: 3x24 | Airdate: Mar 6, 1968
With the Robinsons running out of food, Dr. Smith trades the ship and the Robot to a junk man for food.
Specials
Episode: S01 Special | Airdate: Oct 16, 1997
No Place to Hide is the title of the 1965 pilot episode produced for CBS to promote the television series Lost in Space. The episode was directed byIrwin Allen. It was not broadcast until 1997, which is also the year of the fictional mission's liftoff.