Lost in Space are to be cryogenically frozen for the voyage, and they are set to be unfrozen when the spacecraft approaches its destination. Meanwhile, Dr. Zachary Smith (Jonathan Harris), Alpha Control's doctor, is revealed to be a saboteur on behalf of an unnamed nation. After disposing of a guard who catches him on board the spacecraft, Smith reprograms the "Jupiter 2"s B-9 environmental control robot (voiced by Dick Tufeld) to destroy critical systems on the spaceship eight hours after launch. Smith, however, becomes trapped aboard at launch and his extra weight throws the "Jupiter 2" off course, causing it to encounter a
Lost in Space The foreboding derelict ship from season 1 was redressed to become the "Vera Castle" in season 3. The Fuel Barge from season 2 became a Space Lighthouse in season 3. The derelict ship was used again in season 3, with a simple color change. Likewise the alien pursuer's ship in "The Sky Pirate", was lifted from the 1958 film "War of the Satellites", and was re-used in the episode "Deadliest of the Species". Despite being credited as a "Special Guest Star" in every episode, Smith became the pivotal character of the series. The show's writers expected that Smith would be