Lost In Space Season 1 (Part 1)

On October 16, 1997, the United States is gearing up to colonize space. The Jupiter 2, a futuristic saucer-shaped spacecraft, stands on its launchpad undergoing final preparations. Its mission is to take a single family on a five-and-a-half year journey to an Earth-like planet orbiting the star Alpha Centauri.

The Robinson family consists of Professor John Robinson (Guy Williams), his wife Maureen (June Lockhart), and their three children: Judy (Marta Kristen); Penny (Angela Cartwright); and Will (Bill Mumy). The family is accompanied by U.S. Space Corps Major Donald West (Mark Goddard). The Robinsons and Major West are to be cryogenically frozen for the voyage, and they are set to be unfrozen when the spacecraft approaches its destination.

Dr. Zachary Smith (Jonathan Harris), Alpha Control's doctor, is revealed to be a saboteur working on behalf of an unnamed nation, with which he communicated under the code name Aeolis-14-Umbra. After disposing of a guard who catches him aboard the spacecraft, Smith reprograms the Jupiter 2's B-9 environmental control robot (Bob May, voiced by Dick Tufeld) to destroy critical systems on the spaceship eight hours after launch. Smith becomes trapped aboard at launch, however, and his extra weight throws the Jupiter 2 off course, causing it to encounter asteroids. This, plus the robot's rampage, causes the ship to prematurely engage its hyperdrive, and the expedition becomes hopelessly lost in the infinite depths of outer space. Smith's selfish actions and laziness frequently endanger the expedition, but his role assumes less sinister overtones in later parts of the series.

Season 1
The astronaut family of Dr. John Robinson, accompanied by a pilot and a robot, set out in the year 1997 from an overpopulated Earth in the spaceship Jupiter 2 to travel to a planet circling the star Alpha Centauri. The Jupiter 2 mission is sabotaged by Dr. Zachary Smith – an agent for an unnamed foreign government – who slips aboard the spaceship and reprograms the robot to destroy the ship and crew. However, Smith is trapped aboard, and his extra weight alters the craft's flight path and places it directly in the path of a massive meteor storm. Smith manages to save himself by prematurely reviving the crew from suspended animation. The ship survives, but the damage caused by Smith's earlier sabotage of the robot leaves the crew lost in space. The Jupiter 2 crash-lands on an alien world, later identified by Will as Priplanus, where they spend the rest of the season and survive a host of adventures. Smith remains with the crew and acts as a source of comedic cowardice and villainy, exploiting the eternally forgiving nature of Professor Robinson.