Comments by "rockethead7" (@rockethead7) on "‘Lost in Space’ Stars Reminisce About Sci-Fi Cult Classic" video.
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Well, what you're outlining WAS the original intent. The Dr. Smith character wasn't even in the pilot. That character was an afterthought, and, they intended to have him around for a few episodes, then kill him off. But, the performances by Jonathan Harris (Dr. Smith) and Billy Mumy (Will) stole the show, even though they were supposed to just be background characters. And, the audiences loved the robot. So, responding to audience demands, it didn't take long for the primary plot lines to shift away from the Robinson mother/father, and toward the ones most popular with audiences. Remember, this was a typical weekly show, where they're writing the episodes, shooting the scenes, and then they went on the air a couple of weeks later. They didn't plan out the episodes years in advance. They didn't have scripts ready until they were almost ready to shoot.
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