The Gamesters of Triskelion

Bones : "You're going to leave here without them and run off on some wild goose chase halfway across the galaxy just because you found a discrepancy in a hydrogen cloud?"
Spock : "Doctor I am chasing the Captain, Lieutenant Uhura and Ensign Chekov, not some wild aquatic fowl."

People :

Spock, Leonard H. McCoy

"A species that enslaves other beings is hardly superior, mentally or otherwise." - Kirk to the Providers