An original Star Trek episode titled ‘The Devil in the Dark’.

The starship Enterprise arrives at the pergium mining colony on planet Janus VI to help the colony deal with an unknown creature that has killed 50 miners and destroyed equipment with a strong corrosive substance.
Captain Kirk and his security team begin to search for the creature. Spock, suspecting the creature may be a silicon-based lifeform, modifies their phasers to be effective against it. They encounter the creature, which has the appearance of molten rock, and fire upon it, breaking a piece of its skin off; the creature flees by burrowing through the rock wall at a rapid pace.
Spock conducts a mind meld with the creature once it stops attacking. Spock discovers the creature is severly wounded.
The creature is dying, Kirk advises Doctor McCoy to heal it. Which astounds the good doctor.