In 1974, after the broadcast of "Tyro Ultraman", the movie "Japan Sinks" was broadcast all over Japan, and the storyline of the film was desolate and tragic. Under the influence of this atmosphere, Round Valley Company followed "Otsayven", and the second ultraman series with great innovation, "Leo Ultraman", was born.

Contrary to the light-hearted and humorous style of the previous film, Ultraman Leo, the style of Ultraman is tragic and desolate, all of which is influenced by the sinking of Japan. The plot of episodes 1 and 2 is a true portrayal of "The Sinking of Japan". Unlike the previous work "Ultraman", which had the biological parents of the protagonist Tyro appearing, the biological parents of the protagonist Leo in "Ultraman Leo" were killed at the beginning, and his hometown was destroyed by the Magma Starmen, resulting in Leo becoming an orphan, and the two works formed a sharp contrast. In order to set off Leo's sadness, his birthplace was changed from the Otter Star of the M78 Nebula to the L77 Leo Nebula, which no longer exists. Moreover, the protagonist of "Ottersewen", Severn, was also crippled by the monster in this work, and lost the ability to transform, and could only fight as the protagonist of "Ottersewen", the star clusters. The battle team in this film, the MAC Cosmic Reconnaissance Team, is the only team that has its headquarters set up outside the universe, and unlike the previous teams, the MAC team is the only one in the world, and there is no headquarters in Paris/New York. Unlike the Ace Ultraman and Tyro Ultraman, in which the Otter brothers appear many times, there is almost no Otter brothers in Leo Ultraman, only three times, in episodes 34, 38, and 39.
Moreover, Leo is very different from the previous Ultraman, rarely using light skills in combat, and almost always using fists and feet to solve enemies. As a result, ratings have fallen sharply, because the transformation of Leo Ultraman is too big and too sudden compared to the previous works, making it unacceptable to many viewers in the short term. In order to save the ratings from declining ratings, the Round Valley Company racked their brains, first creating two new characters - Leo's brother Astra, and the legendary hero - the King of Otter, and then arranged for the protagonist of "The First Ultraman" - Kurobe Jin, and fuji Akiko - Sakurai Hiroko, the actor of Torano in "Seven Ultraman" - Yuriko Ryomi, and the protagonist of "The Return of Ultraman" - Tuanjiro, the actor of Yuriko Yau - played by Yuriko Yau - Katsuragi Mika and others made friendly cameos, and then in episodes 38 and 39, described the thrilling plot of "Otter Brothers vs Leo Brothers" to save the ratings. But it turns out that all this is just in vain!
And the "Disc Creatures" series, which begins in episode 40, is even more cruel to the extreme! In episode 40, the MAC headquarters is completely destroyed, and the plot of the life and death of the star clusters is unknown, which is a great tragedy. Because this is the only time in the Showa series of works.
Faced with the extreme failure of "Leo Ultraman", Round Valley Company had no choice but to make a decision to deny this work. However, things have changed, the bucket has shifted, and today, Leo Ultraman has finally been rehabilitated and recognized by Round Valley Company again
Mac is the Earth Defense Force inside Leo.
MAC Team 1 (Leo is indeed the saddest, even his teammates were wiped out.) )
Cosmic Monster Attack Team - MAC is the abbreviation of "Monster Attacking Crew", an earth defense organization formed to defend against monsters and cosmic people who invaded the earth from the universe, and its headquarters was set up in the space station over Japan, and it was swallowed up by the disc creatures in the 40th episode and completely destroyed.
The 30-year-old Star Cluster (Akira Moriji), the leader of the MAC team, Severn Ultraman, was seriously injured in battle with the Magma Starman and the Kiras Monster Brothers, lost the ability to transform, and then asked Torreo Ultraman to defend Earth. The devil training for Fengyuan was very severe, but Fengyuan improved quickly. Very calm and has a big picture view. Unable to transform, he often helps Leo in battle with the lifespan-damaging Odyssey. Later, the disc creatures attacked the earth, the MAC team was completely destroyed, and the regiment's whereabouts were unknown. But the appearance of Leo in Feng Yuan's dream in Leo's final words gave him encouragement.
Fengyuan (おおとりゲン) (played by Zhen Xialong) is a 20-year-old human body of Leo Ultraman. His hometown, L77, was destroyed by the Magma, making Earth his second home. Originally a coach at Seongnam Sports Club, he came to help Severn and Magma Starmen in a battle with twin monsters, and then joined the MAC team at the invitation of the regiment. Constantly training hard. Transformed by the ring worn on his left hand, the "Pupil of the Lion". After the MAC team is wiped out, he stays at the home of nurse Miyama and continues to fight against the disc creatures sent by Blackstar on his own. Finally, leave the earth after destroying all disc creatures.
Akio Kuroda (played by Akira Kuroda)
27 years old, MAC team number 3. The original vice-captain of the MAC team, he was transferred away in episode 10 of "Poor Wandering Monsters".
Ichiro Aoshima (Played by Yuichi Yanagisawa)
24 years old, likes to fight, bad temper, after the transfer away.
Kiyohiko Akaishi (played by Kenji Oshima)
22 years old, MAC6 team member, good at checking the machine in episode 16 "Voices of Terror" transferred away.
Shirakawa Ryoko (played by Mieko Mita)
18 years old, female team member, responsible for the team communication work. Died in the 40th episode when the Disc Creatures struck.
Momoi (Played by Kyoko Shindama)
19 years old, female team member, is a communications specialist. Episode 16 was transferred away.
Jun Shiratori (played by Masaharu Matsuzaka)
At the age of 25, the team member who first appeared in Episode 6, surnamed Shirato, worked in the MAC Intelligence Department, and joined the MAC team in revenge after his lover Yoko was killed by the Cali Starmen. Later, he was promoted to a full team member and became good friends with Feng yuan. In episode 40 the Disc Creatures are killed in the line of duty when they come to attack.
Suzuki (played by Nobuya Kashima)
The first to die on the MAC team, he was beheaded by the Zulus in Episode 3.
Atsushi Hirayama (played by Nobuo Hirazawa)
Mac team members, replacing Kuroda as mac second-generation vice captains, are relatively silent. In episode 18 of Vampire Bats, he was transferred.
Daisuke Sato (played by Shigeo Teba)
He took over as the third-generation vice captain of the MAC team in Hirayama and has a distinct personality. Died in the 40th episode when the Disc Creatures struck.
Kazuhira Kajida (Played by Takashi Asakura)
Joins MAC with Shiratoro and takes over as Aoshima and Akashi, and is McGee 2 pilot, debuting in episode 17 of "The Wolf Man's Bride". Killed in the 40th episode during the Disc Creature Attack.
Yoji Kitayama (played by Kenta Kada)
Former skier who won ski championships and saved the Alpha Star, left after being seriously injured in battle and having one leg amputated.
Matsuki Eye (played by Tomoko Lan)
Female team member, who appeared in episode 29 of "Abandoned Children and Anu", took over as Haruko Momoi as a member of the MAC communications team. In episode 40 the Disc Creatures are killed in the line of duty when they come to attack
In 1975, after the release of Leo Ultraman, the Ultraman series once again entered a period of silence, during which time the Japanese special-shot market was monopolized by Toei's Kamen Riders and Super Teams.