Episode Behind the Scenes

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The shot of the empty bridge of the Enterprise would later be incorporated into the "Star Trek: The Next Generation" episode "Relics".
   
Frank Overton, who played Elias Sandoval, died shortly after this episode aired.
   
The coveralls Mr. Spock wears after he's been "absorbed" by the spores would later reappear as the clothing his empty-headed body would wear in "Spock's Brain".