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The Robinson family (without the later-to-be-added Robot B-9 and Dr. Smith characters) rockets into outer space, only to crash-land onto a desert planet.

The Robinson family takes off on the pioneering launch of the Jupiter 2, towards a planet orbiting Alpha Centauri. But sabotage by Dr. Zachary Smith leaves the family and their robot lost in space.

Following a tense effort to rescue John Robinson from deep space, the Jupiter 2 is drawn inside a massive alien spaceship. There, the family confronts a strange race of bubble creatures.

The family crash-lands on an unknown planet in an attempt to rescue Professor Robinson. Maureen and the others use the chariot to man the search, only to face more havoc from Dr. Smith's diabolical schemes.

The Robinsons set up camp on a planet populated by strangely evolving life forms. As the family moves their camp in search of warmth, they are confronted by a giant Cyclops.

Following a quick escape from an ancient city, the Robinsons must flee the heat of an unknown planet's sun. Heading through storms and earthquakes, they land safely- only to face an unknown entity from outer space.

The Robinsons try to persuade a long-stranded astronaut, James Hapgood, to take Will and Penny back to Earth. He refuses, but has a change of heart after a near tragedy befalls Penny.

Penny befriends a lonely echo voice she calls "Mr. Nobody." But when the girl appears to be injured, the being's wrath threatens the Robinsons-until Penny persuades it not to hurt her family.

Glowing humanoids invade the Robinsons' colony in search of a brain to navigate their ship. Their plan is foiled when Will's worry over his parents' safety makes his brain unusable.

The Robinsons' water crisis deepens when Dr. Smith uses their only water supply for a shower. But a strange alien fruit may be the answer-until it causes Smith to grow to twice his normal size.

The Robinsons confront their mistrust of an alien family that has beamed in from space. Unable to understand their language, they fear for Will's safety when he and the little alien boy disappear.

When Dr. Smith and Will discover a magic wish-granting machine, the family becomes intoxicated with greed. But the party ends when a strange alien creature reclaims the magic machine.

Will comes up with an idea for a two-man ship that can travel to Earth. But when Dr. Smith hijacks the ship, a crash landing finds Will and Smith trapped in a jungle, pursued by a bush creature.

A friendly little dog survives the crash of a space capsule and leads Professor Robinson and Don West to Judy, just in time to save her from the claws of a giant hairy mutant.

The family is threatened by a giant cyclamen plant that can create realistic duplicates of anything it absorbs. Soon the plant feeds on the Jupiter 2's fuel supply and then makes an evil version of Judy Robinson.

Will discovers a matter-transfer portal that returns him to Earth, but once there, the residents of a small town in Vermont have a hard time believing his stories of life in space.

The family comes upon an evil alien zookeeper, whose trance-like powers can entice exotic animals-and young humans like Will and Penny-to follow him into captivity.

Chaos reigns as the Keeper's creatures, let loose by the robot and Dr. Smith, overrun the planet. The Keeper refuses to stop the heinous animals unless the family gives him Penny and Will.

The Robinsons find new hope when they meet a marooned pirate with an interstellar vehicle capable of returning to Earth. But their plans are foiled when a slithering mass pursues the pirate in search of a stolen object.

A strange, ghost-like presence appears after an explosion in a bog awakens it. Dr. Smith conducts a séance, certain the rampaging ghost is his dead uncle's spirit.

The family's robot is seemingly replaced when Will repairs a robotoid from an advanced civilization - until the new machine wreaks havoc by trying to take over the ship.

Frustrated with impending adolescence, Penny falls into a mirror and enters a strange new dimension. There she befriends a lonely alien boy who tells her she can never leave Mirrorland - but she'll never have to grow up.

A tough little alien boy and his father attempt to prove their superiority to humans by challenging John and Will Robinson to a test of strength and bravery.

Dr. Smith makes a hard bargain when his dealings with a space trader go awry, and he finds himself in an intergalactic contract he's unable to break.

Dr. Smith lobbies to become king of a luxurious planet named Andronica, only to discover he's to be used as a human sacrifice.

An oddball family of alien hillbillies ensnares the Robinsons. Their daughter tries to romance Don while their pet werewolf and fast-growing, man-eating plants spell trouble.

Dr. Smith discovers the dark side of greed when he steals a magic disc that turns everything he touches - even Penny - into platinum.

John, Don and Will discover an underground world of soldiers frozen in suspended animation, waiting for their princess to be awakened by a kiss - so they can take over the universe.

Will comes upon an alien spaceship that takes him to the Sixth dimension, transforming him into a boy genius. Jealous Dr. Smith uses the ship as well, with very different results.

The mind and soul of Professor John Robinson is overtaken by an unseen alien spirit, forcing Robinson to turn against the family as he tries to take over the ship.