Charlie's real name - Celeste - is a tribute by writer Robbie Thompson to his mother.
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Robbie Thompson tweeted to William Shatner, that the episode was nearly named [http://en.memory-alpha.org/wiki/The_Enemy_Within_%28episode%29 "The Enemy Within"] after an original Star Trek epsiode where Captain Kirk is split into a good and evil version of himself after a transporter accident.}}
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* [[10.11 There's No Place Like Home (transcript)]]