Episode:2x18
The Immunity Syndrome

Jack's Rating:

The Enterprise is sent to investigate a giant amoeba-like creature that has killed all life on Starbase 6 and the Vulcan-crewed starship Intrepid, and Spock penetrates the amoeba in a shuttlecraft.

Features:
Stardate: 4307.1
Air Date: 01/19/68
Director: Joseph Pevney

Jack's Review
Another that should be labeled a classic. The story is classic sci-fi and fits perfectly into the story-of-the-week formula of the classic Trek shows. A tidbit of trivia - this is the last episode of TOS to show the interior of a shuttlecraft, the last episode directed by Joseph Pevney, and the last time Kirk wears the green wrap-around tunic - although, filming order actually makes "Bread and Circuses" the last appearance of the green tunic on-screen.