The original pilot episode, which never aired, did not feature either the Robot or Doctor Zachary 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.
Lost in Space
The Robinsons, Earth's first family of outer space, head to colonize Alpha Centauri in their flying saucer, the Gemini 12, but crash land on an uncharted planet where they deal with its challenges and dangers.