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 during its original network television run. The more cerebral "Star Trek" never averaged higher than 52nd in the ratings during its three seasons, while "Lost in Space" finished season one with a rating of 32nd, season two in 35th place, and the third and final season in 33rd place. "Lost in Space" also ranked third as one of the top five favorite new shows for the 1965–1966 season in a viewer TVQ poll. The other top contenders were "The Big Valley", "Get Smart", "I Dream of Jeannie" and "F Troop". "Lost in Space" was the favorite show of John F.