Season 1

The first season of Lost In Space is widely regarded by fans as the best, with the first 5 often mentioned as the finest episodes of the show.

Earth's first family in space faces trials and tribulations as they become lost on their way to colonize a planet circling Alpha Centauri. Smith and the Robot are noticeably absent.

A saboteur reprograms the Robot to destroy the Jupiter 2, but gets trapped aboard at launch. The Jupiter 2 is damaged, but survives and becomes hopelessly lost in space.

The crew of the Jupiter 2 encounters a seemingly derelict space ship that dwarfs the Jupiter 2.

Professor Robinson attempts to scout a desolate planet, but his parajet rockets fail. Major West attempts to land on the planet to search for the Professor, but the Jupiter 2's rockets also fail and the ship crash lands.

The Jupiter 2 crew faces dangers on the planet they crashed on, including a gigantic cyclops, microbes in the soil that cause crops to grow out of control, and an erratic orbit that causes extreme heat and cold.

The Robinsons and Major West head south in the Chariot to avoid the incredibly harsh cold. Meanwhile, Smith discovers that the erratic orbit of the planet around its sun will cause a sudden and intense temperature spike and sends the Robot out to warn them

A fellow space traveler from Earth, Jimmy Hapgood, happens to land on the planet where the Robinsons are stranded. They help him repair his ship and John and Maureen ask Jimmy to take Will and Penny back to Earth. Smith, however, has other plans.

Penny makes friends with a mysterious invisible entity in a cave. It talks to and learns from her. But Dr. Smith draws the wrath of the entity when he destroys the cave in search of riches and, in the process, inadvertently injures Penny.

Invaders From The Fifth Dimension, in the form of floating alien heads, search Preplanis for a humanoid brain to power their spaceship and take them home. When they capture Smith, they quickly find out that he's, by Smith's own admission, "a scoundrel, a thoroughly bad sort, hopelessly unreliable". So, Smith offers up a "small Robinson", one that will fit in the alien ship... Will.

When Smith uses all of the potable water for a shower, he forces the Robinsons to search for a new water source. They find it, in the form of fruit that grows in a brackish well. Unfortunately for Smith, he eats it before Professor Robinson has a chance to test it. Smith runs off, sure the Robinsons have purposely poisoned him, and takes the last of the working fuel cells with him. Unbeknownst to him, he turns into a paranoid giant overnight.

An alien probe precedes the arrival of an alien race of beings called the Taurons. The Robinsons believe these aliens are peaceful and looking to settle on Priplanus. Dr. Smith, however, thinks they are the first arrivals of an enormous invading army.

Smith and Will stumble on to a derelict alien ship and discover a machine that grants wishes. Use of the machine causes tensions in the group

Will's attempts to build a probe to get a message back to Earth fail and leave the deutronium supply seriously depleted. Don and John's then develop an alternative fuel, but can't stabilize the output. The decision is made to pull the reactor chamber out of the Jupiter 2 and turn it into a small craft with which Don will attempt to find rescuers. Smith, however, has other plans.

One Of Our Dogs Is Missing

Attack Of The Monster Plants

Return From Outer Space

The Keeper: Part 1

The Keeper: Part 2

The Sky Pirate

Ghost In Space

War Of The Robots

The Magic Mirror

The Challenge

The Space Trader

His Majesty Smith

The Space Croppers

All That Glitters

The Lost Civilization

A Change Of Space

Follow The Leader

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