Ultraman Leo is an Ultra foreign to the Land of Light, instead hailing from the fallen Planet L77 of the Leo constellation, where he and his brother Astra were royalty. After his planet was destroyed by Alien Magma and his twin Giras kaiju, Leo traveled to Earth, intending to make it a second home. While there, he blended into human society as Gen Ohtori, and became a gym instructor at a fitness club for children. But, when the Alien Magma that destroyed L77 came to conquer Earth, he was forced to take action. Leo met Ultraseven during his initial fight against Alien Magma, and became the first Ultra Crusader of Earth to not hail from the Land of Light. Unlike most of the previous Ultras to visit Earth, Leo's fighting style specializes in martial arts giving him far greater physical abilities than any other known Ultras. Despite his foreign origins, he, along with Astra, were readily accepted into the pantheon of the Ultra Brothers. During his tenure on Earth, Leo and Seven became very close, and it was for this reason that Seven would eventually entrust the training of his son Ultraman Zero to Leo and Astra.
The Death of Seven! Tokyo Is Sinking!
The Big Sink! The Last Day of the Japanese Archipelago
A Farewell to Tears
A Vow Between Men
Don't Cry! You're a Man
You're a Man! Burn On!
A Beautiful Man's Disposition
Certain Kill! Monster Challenger!
Bridge of Friendship That Spans Space
The Wandering Monster of Sorrow
One Man Covered in Mud
The Adventure Nut Arrives!
Huge Explosion! A Desperate Couple of Aliens
Certain-Kill Fists! A Young Boy Calls Upon a Tempest
Deadly Designs in Darkness! Attacking With Fighting Spirit
The Woman Who Faded Into the Night
Bride of the Wolfman
Vampire! The Bat Girl
The Revival of the Half-Man Fish
The Mysterious Boy of the Little Bear
I Saw a Goddess in the Far North
The Leo Brothers vs the Monster Brothers
The Mischievous Alien Who Fell Out of Bed
The Beautiful Virgo Maiden
The Rhinoceros Beetle Is a Space Invader
Ultraman King vs the Magician
Mighty! Momotaro!
The Return of the Bearded Captain!
Reunion of Fate! Dan and Anne
The Monster's Favor
The White Flower That Protects Earth
Farewell, Princess Kaguya
The Leo Brothers vs the Space Demon Alien
Ultra Brothers, Eternal Vows
I'm a Monster General!
Fly Leo Brothers, Save the Space Base!
Mystery! The Mirror in Which the Devil Lives
Battle! The Leo Brothers vs. the Ultra Brothers!
The Leo Brothers and the Ultra Brothers, Time of Victory
MAC Annihilated! The Flying Saucer Is a Living Creature
The Saucer Creature from the Evil Planet Is Here!
The Assassin Is a Flying Saucer
Challenge! The Terror of the Blood-Sucking Saucer
The Shooting Star from Hell
The Phantom Girl
The Fighting Leo Brothers! The End of the Flying Saucer Beast
The Girl Who Collects the Stardust of Demons
The Giant Bird Saucer Attacks Japan's Archipelago
The Red Assassin Who Beckons Death!
The Life of Leo! The Miracle of King!
Goodbye Leo! Journey to the Sun
Marvel's Avengers
Misfits
Darkwing Duck
Les Kiki Tronic
Juukou B-Fighter
Juken Sentai Gekiranger
Space Sheriff Sharivan
Himitsu Sentai Gorenger
The Waking
The Red Ranger Becomes an Adventurer in Another World
The Sandman
SAINT SEIYA: Knights of the Zodiac
Los Elegidos
KENGAN ASHURA
Ultraman
Super Robot Monkey Team Hyperforce Go!
Ultraman Dyna
Flash Gordon
Tattooed Teenage Alien Fighters from Beverly Hills
Ultraman Tiga