3x1 – Folge 1
The Robinsons leave their planet to escape a collision with a comet and find a ship full of frozen convicts.
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3x2 – Folge 2
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 1940's.
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3x3 – Folge 3
A spaceship requests medical help for their computer and Dr. Smith has to perform brain surgery on it.
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3x4 – Folge 4
After killing a hostile alien, Professor Robinson comes across a "hunter" and he must replace his dead prey.
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3x5 – Folge 5
On a planet where a primitive people are ruled by a computer, Doctor Smith goes against character and saves Major West's life.
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3x6 – Folge 6
Using an alien machine Doctor Smith creates an army of cyborgs to conquer the universe.
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3x7 – Folge 7
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.
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3x8 – Folge 8
Accidently 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.
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3x9 – Folge 9
A group of space hippies are going to destroy the planet the Robinsons are on.
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3x10 – Folge 10
When a gaseous creature engulfs the Jupiter 2, the other crew members disappear leaving Will and Doctor Smith alone.
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3x11 – Folge 11
The robot falls in 'love' with an evil female robot sought by two aliens.
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3x12 – Folge 12
Galaxic showman Farnum B. wants to exhibit the Robinsons in his zoo.
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3x13 – Folge 13
Two escaped thieves transform themselves into humans and pretend to be tourists as Smith turns the Jupiter 2 into a hotel.
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3x14 – Folge 14
Will meets a princess who is escaping two bounty hunters and Will gets kidnapped instead.
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3x15 – Folge 15
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 a evil John Robinson.
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3x16 – Folge 16
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.
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3x17 – Folge 17
Penny is kidnapped by aliens who think that she is the missing Princess Alpha.
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3x18 – Folge 18
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.
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3x19 – Folge 19
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.
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3x20 – Folge 20
Don and Doctor Smith are sent to an intergalactic prison after coming across an escapee.
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3x21 – Folge 21
Farnum B the intergalactic showman again encounters the Robinsons as he presents the Galaxy Beauty Pageant that Judy enters.
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3x22 – Folge 22
Doctor Smith disposes of a plant that grows to a gargantuan size and becomes attached to the Jupiter 2.
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3x23 – Folge 23
Smith lands the pod on a planet where plants are the highest form of intelligence next to the writer of this episode. The Robinsons lands only to be captured by Tybo a giant carrot. He plans to turn them into trees while Dr. Smith becomes a stalk of celery.
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3x24 – Folge 24
With the Robinsons running out of food, Dr. Smith trades the ship and the robot to a junk man for food.
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