Ultraman Leo (ウルトラマンレオ, Urutoraman Reo^?) is a Japanese tokusatsu TV show and is the 7th show in the Ultra Series. Produced by Tsuburaya Productions, Ultraman Leo was aired between April 12, 1974 to March 28, 1975, with a total of 51 episodes. Tatsumi Nikamoto was the in-suit actor of Ultraman Leo.

Ultraman Leo comes from Nebula L77 (Leo constellation), and takes the human form of Gen Otori. Ultraseven appears to fight a new foe, Alien Magma and his two "pets", the Red and Black Gillas. Ultimately, Ultraseven is greatly overpowered and his leg is graphically broken by Black Gillas. Ultraman Leo drives off the foes, but Ultraseven is confined to his human form because of his injuries and due to the Ultraeye being damaged when he attempted to transform. Dan then maintains his role as Captain of MAC (Monster Attack Crew). Gen is a gymnastics teacher on the side and joins MAC to defend the Earth. Gen and Dan regularly train together, allowing Ultraman Leo to learn many moves in human form. In episode 34, Dan asks Ultraman Jack to take the Ultraeye back to M78 to be restored while he heals on Earth. However in Episode 40, MAC is destroyed by Silver Bloom, a saucer monster that belongs to Commander Black. During the attack Dan asks Leo to keep defending the Earth and disappears in the conflagration, it is later shown that he was taken back to M78 to be fully healed and restored as Ultraseven. Gen is now unemployed and spends most of his time training the kids to defend themselves as well as defending the Earth as Ultraman Leo. When Commander Black captures Gen when he cannot transform compeltely, Gen as Leo is dismembered, only to be brought back to life by Ultraman King. Leo would face Black's final monster, Black End, with the kids he trained, of whom the latter kill Black, and hand the sphere used to control Black End to Leo. Finishing his mission, Gen removes his Lion Ring and sets off to tour Earth, his "second home".

Ultraman King (ウルトラマンキング, Urutoraman Kingu^?) is a fictional character and is one of the legendary heroes of the Ultraman Universe. In the 2009 film Mega Monster Battle: Ultra Galaxy, Ultraman King is voiced by former Prime Minister of Japan Junichiro Koizumi.

He is considered to be and respected as the "God" or Elder of all Ultra heroes. Despite the name, he is not the king of the Land of Light. He is supposedly all powerful and undefeatable, but lives on his own on the King Planet. Before Leo encountered him, no Ultraman had ever seen him in the flesh. He is extremely powerful in the appearances he has made, showing able to bring Ultraman Leo back to life after he'd been sawed to pieces by Commander Black without any effort and in the latest movie, showed the power to not only defeat Ultraman Belial with ease but form an entire moon around him.

His age was revealed to be 300,000 years in the 2003 movie New Century Ultraman Legend 2003: King's Jubilee (新世紀2003ウルトラマン伝説 THE KING'S JUBILEE, Shinseiki Urutoraman Densetsu: THE KING'S JUBILEE^?), but the chronological order of this work is unclear. In manga, particularly Ultraman: Super Fighter Legend, he has been depicted as a legend who has defeated many monsters on his own.