Plummer had the title role in "Oedipus the King" (1968) and "The High Commissioner" (1968), playing an Australian in the latter. Plummer was one of many stars in "Battle of Britain" (1969) and was Atahualpa in "The Royal Hunt of the Sun" (1969). Plummer had the lead in a musical, "Lock Up Your Daughters" (1969) and was the Duke of Wellington in "Waterloo" (1970). "The Pyx" (1973) was his first Canadian film. Plummer appeared in "The Man Who Would Be King" (1975) (playing Rudyard Kipling), "The Return of the Pink Panther" (1975), "Aces High" (1976), "The Silent Partner" (1978), "International Velvet" (1978), "Murder by Decree" (1979) (playing Sherlock Holmes), "Somewhere in Time" (1980), "Eyewitness" (1981), "Dragnet" (1987), "Shadow Dancing" (1988), "" (1991), "Malcolm X" (1992), "Wolf" (1994), "Dolores Claiborne" (1995), "12 Monkeys" (1995), "Syriana" (2005), "Must Love Dogs" (2005), "The New World" (2005), "The Lake House" (2006) and "Remember" (2015). One of Plummer's most critically acclaimed roles was that of television journalist Mike Wallace in Michael Mann's biographical film "The Insider" (1999), for which he was honoured with several critics' awards for Best Supporting Actor, though a corresponding Academy Award nomination did not materialize. Other successes include his roles as Dr. Rosen in Ron Howard's Academy Award-winning "A Beautiful Mind" (2001), Arthur Case in Spike Lee's film "Inside Man" (2006), and the philosopher Aristotle in "Alexander", alongside Colin Farrell. In 2004, Plummer played John Adams Gates in "National Treasure". Plummer has also done some voice work, such as his role of Henri the pigeon in "An American Tail" (1986), the villainous Grand Duke of Owls in "Rock-a-Doodle" (1991), the antagonistic Charles Muntz in "Up" (2009), and the elder leader 1 in the Tim Burton-produced action/science fiction film "9" (2009). He also served as the narrator in Philip Saville's film "The Gospel of John" (2003).