Star Trek: Metamorphosis Rewatch
April 11, 2015 10:18 AM - Season 2, Episode 9 - Subscribe
When their shuttle is diverted to Gamma Canaris N by an amorphous entity known as the "companion", Kirk, Spock, and McCoy encounter Earth's Warp Drive pioneer, Zefram Cochrane, who appears to have survived there alone for 150 years.
"Metamorphosis" was first broadcast November 10, 1967 and repeated July 19, 1968. It is episode #38, production #31, written by Gene L. Coon, and directed by Ralph Senensky.
AV Club Review
Memory Alpha Link
The episode can be viewed on Netflix