Stardate: 3417.3

Original airdate: 3/2/1967

Writer: D.C. Fontana

Director: Ralph Senensky

Guest stars:

Jill Ireland            Leila Kalomi, botanist, former friend of Spock
Frank Overton           Elias Sandoval, leader of the expedition
Grant Woods             Kelowitz, biologist
Dick Scotter            Painter

Crew Appearances:
Kirk, Spock, McCoy
Sulu

On Omicron Ceti III, the Enterprise discovers 45 colonists unaffected after three years' exposure to deadly Berthold rays. Spock is reunited with an old friend, Leila Kalomi, who exposes him to strange spores causing Spock to release his emotions and he promptly declares his love for her. The spores affect the entire Enterprise crew, which has beamed down to the planet. Kirk, under the spores' influence, prepares to abandon ship. But if he leaves, no one can beam back up! Kirk overcomes the spores effect and by causing Spock to get really mad, restore their sanity and regain control.

Quotes:
"I love you." Spock.
-------
"You want to see how quick I can put you in a hospital?" McCoy.