Star Trek: The Original Series
The Devil in the Dark
S1 E25:
When mysterious deaths and damage in the mines of Janus VI threaten operations at several colony worlds, Kirk and Spock find not a monster but a mother — a silicon-based lifeform just doing its duty. The foe becomes a friend thanks to McCoy's cure by concrete and the Vulcan's mind-meld.
Starring
Ken Lynch, Barry Russo, Brad Weston