Though he may be done with the iconic role now, Shatner has devoted the better part of his life in servitude of Kirk. While the original show may have ran for only three years in the 1960s with 80 episodes, it soon gained a cult following, and was brought back in movie form by popular demand.
Shatner would go on to play Kirk in seven Star Trek films starting in 1979 and ending with a sad and heroic death in Star Trek: Generations in 1994, nearly 30 years after the original show began. But Shatner refused to let Kirk die for good, resurrecting him in a series of his own novels.
Star Trek: The Original Series Behind The Scenes Gallery