Lost in Space - Season 3 (1967)

After killing a hostile alien, Professor Robinson comes across a "hunter" and he must replace his dead prey.

On a planet where a primitive people are ruled by a computer, Doctor Smith goes against character and saves Major West's life.

Using an alien machine Doctor Smith creates an army of cyborgs to conquer the universe.

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.

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.

A group of space hippies is going to destroy the planet the Robinsons are on.

When a gaseous creature engulfs the Jupiter 2, the other crew members disappear leaving Will and Doctor Smith alone.

The Robot "falls in love" with an evil female robot sought by two aliens.

Galaxic showman Farnum B. wants to exhibit the Robinsons in his zoo.

Two escaped thieves transform themselves into humans and pretend to be tourists as Smith turns the Jupiter 2 into a hotel.

Will meets a princess who is escaping two bounty hunters, yet Will gets kidnapped instead.

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.

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.

Penny is kidnapped by aliens who think that she is the missing Princess Alpha.

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.

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.

Don and Doctor Smith are sent to an intergalactic prison after coming across an escapee.

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.

Doctor Smith disposes of a plant which has grown to an intense size, and becomes attached to the hull of the Jupiter 2.

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.

With the Robinsons running out of food, Dr. Smith trades the ship and the Robot to a junk man for food.