Ken Watanabe is a Japanese actor. To English-speaking audiences, he is known for playing tragic hero characters, such as General Tadamichi Kuribayashi in Letters from Iwo Jima and Lord Katsumoto Moritsugu in The Last Samurai, for which he was nominated for the Academy Award for Best Supporting Actor. Among other awards, he has won the Japan Academy Film Prize for Best Actor twice, in 2007 for Memories of Tomorrow and in 2010 for Shizumanu Taiyō. He is also known for his roles in Christopher Nolan's films Batman Begins and Inception, as well as Memoirs of a Geisha, and Pokémon Detective Pikachu.

Memoirs of a Geisha is a 2005 American epic period drama film directed by Rob Marshall and adapted by Robin Swicord from the 1997 novel of the same name by Arthur Golden. It tells the story of a young Japanese girl, Chiyo Sakamoto, who is sold by her impoverished family to a geisha house to support them by training as and eventually becoming a geisha under the pseudonym "Sayuri Nitta." The film centers around the sacrifices and hardship faced by pre-World War II geisha, and the challenges posed by the war and a modernizing world to geisha society. It stars Zhang Ziyi in the lead role, with Ken Watanabe, Gong Li, Michelle Yeoh, Youki Kudoh, Suzuka Ohgo, and Samantha Futerman.