Nimoy's fame as Spock was such that both of his autobiographies, "I Am Not Spock" (1975) and "I Am Spock" (1995), were written from the viewpoint of sharing his existence with the character. Nimoy has a star on the Hollywood Walk of Fame. In 2011, Nimoy voiced the main villain, Sentinel Prime, in "". In 2009 and in 2013, Nimoy played Spock Prime in the J. J. Abrams Star Trek movies: "Star Trek" and "Star Trek Into Darkness". He also voiced Master Xehanort in "Kingdom Hearts Birth by Sleep" and "".