5. Captain James T. Kirk and Mr. Spock, 'Star Trek'
The hot-headed, hot-blooded human, the cold, emotionless Vulcan — it was the brotherhood that transcended personalities, cultures, even species. Captain James Tiberius Kirk and Mister Spock (son of Sarek) embodied the dueling tendencies of the Cold War liberalism that informed Gene Roddenberry's seminal sci-fi series: One was impulsive and emotional, the other scientific and logical. The roles launched actors William Shatner and Leonard Nimoy into immortality, and the contours of their relationship can be seen everywhere from Obi-Wan and Anakin to Iron Man and Captain America today.