Spock

"I am, and always shall be, your friend."

- Spock's most famous quote, to James T Kirk Spock – full name generally considered unpronounceable to Humans – was the deuteragonist of Star Trek: The Original Series and of the first six Star Trek motion pictures. He was portrayed by the late Leonard Nimoy in the TV series Star Trek and in the first six films, and by Zachary Quinto (as well as Nimoy) in the 2009 film Star Trek, and in it's sequel Star Trek Into Darkness, which was also this character's final appearance.

History
"The needs of the many outweigh the needs of the few, or the one."

- Spock's philosophy

Spock was a Human/Vulcan hybrid who became one of the most distinguished and respected figures in the United Federation of Planets in his lifetime. As a Starfleet officer in the latter half of the 23rd century, he served aboard the starship USS Enterprise as science officer under Captain Christopher Pike, as first officer and science officer under Captain James T. Kirk, and as the Enterprise 's commanding officer during her tenure as a training vessel.

He met hsi death in the feature film The Wrath of Khan, due to radiation poisoning, and before his death he expressed famously that what he did, he did in recognition that the lives of the crew were more valuable than his own. He was later resurrected.

In the 24th century, Spock became a celebrated ambassador and adviser to the Federation's leadership when he became the Vulcan ambassador to the Romulan Empire. He disappeared in 2387 after saving the Federation from the supernova that destroyed Romulus, causing the creation of the alternate reality.