Leo the Lion (新ジャングル大帝 進めレオ! Shin Janguru Taitei: Susume Reo!?, New Jungle Emperor: Move Ahead Leo!) is a sequel to the Japanese-American co-produced series "Jungle Emperor", or Kimba the White Lion. Osamu Tezuka had always wanted his story of Kimba to follow Kimba's entire life, and the Jungle Emperor/Kimba series was such a hit in Japan that Dr. Tezuka produced a sequel, without his American partners, in 1966.