William Shatner is a Canadian actor and author who has been working in the entertainment industry for over fifty years. He is perhaps best known for his role as Captain Kirk in the classic science-fiction television show Star Trek. He has appeared in a number of movies, including the only movie ever made in esperanto. Additionally, he has been in a number of advertisements and television shows, including Encore in the Mission: Impossible series (season six episode two, and season seven episode seven). Shatner now stars as a rather bungling and eccentric lawyer in the television show Boston Legal.
Shatner has frequented the Tonight Show where he would ridicule Sarah Palin's Twitter posts and book by reading them in a spoken word style. Palin has since been on the show, mocking Shatner's own works and experiences, especially the fact that he "confronted an elephant on a moonlit night in his underwear."