The original pilot episode, which never aired, did not feature either the robot or Dr. Smith (who was added later by 20th Century Fox as an antagonist). Much of the original footage was re-used in the first four televised episodes. Written by
Did You Know?
This pilot was never aired during the initial broadcast run or in syndication (presumably because Dr. Smith and the Robot were not included in the original cast). It was considered to be lost until it was accidentally discovered in the mid 1990s. The SciFi channel had a special called "Pilot Playhouse" where they aired the first episodes of various science fiction TV shows. It was during research for this special that the original pilot was located and broadcast for the very first time. See more
Time values for the space journey conflict. Alpha Centauri is 4 light years from Earth (4.37 to be precise). The Gemini 12 spacecraft (renamed Jupiter 2 in the televised series) will travel there at the speed of light, taking "a century" rather than 4 years (or 4.37 years). The trip is also referred to as taking 98 years. Finally, during the meteor storm the ship is said to be moving at 18,400 miles per hour which is far less than the speed of light (186,0000 miles per second). See more