Season 1 Episode 28: The City on the Edge of Forever Filmed:  February 1967 First Air Date: April 6, 1967 Karen: Kirk sacri...

Season 1 Episode 25: This Side of Paradise Filmed:  January 1967 First Air Date: March 2, 1967 Karen: Mr. Spock in love. Wha...

Season 1 Episode 21: Tomorrow is Yesterday Filmed: November/December 1966  First Air Date: January 26, 1967 Karen: Time trav...

Season 1 Episode 7: Charlie X Filmed: July 1966 First Air Date: September 15, 1966 (2nd episode aired) Karen: An episo...