Star Trek: The Original Series - Volume 14
Errand Of Mercy: (Episode 27)
This is the first time we meet the Klingons, the archenemies of the Federation. Kirk and Spock attempt to persuade the council of neutral Organia to join the Federation. While they negotiate, the nefarious Klingons invade and enslave the planet's sheep-like citizens. The Organians help Kirk and Spock disguise themselves as civilians, only to hand them over to the Klingons. The U.S.S. Enterprise and the Klingon ship poise to engage in an all-out battle.
The City On The Edge Of Forever: (Episode 28)
Accidentally overdosed with cordrazine, a delirious McCoy transports to the planet below. Kirk, Spock and a landing party discover a "time portal" through which McCoy disappears. After the U.S.S. Enterprise suddenly vanishes, Kirk and Spock decide to enter the portal to search for McCoy. Arriving in 1930, Kirk falls deeply in love with Edith Keeler (Joan Collins), only to learn she must die in order for time to return to normal.