Ultraman Leo, known as the little knight-errant prince, as a special existence among the Otto brothers, is different from other brothers in Star. The obvious difference is that his unique signature on the abdomen and his fighting style are based on martial arts. Later, I learned that Leo was not a soldier born and raised in the country of light, but the prince of L77 star next door. After his hometown was destroyed, he came to the country of light and was recommended by King Otto as a member of the Otto brothers. So how Leo's hometown was destroyed is a question hidden among fans for many years. This question gave us the answer in the biography of Altman 0. Leo's hometown L77 was invaded by Magma-Seijin, and Leo's father Arus used his body as a shield to save Leo's life. He died after blocking the photon cannon of magma. And Leo, as the brother of Prince Brother in 177. At first, I was very afraid of my hidden power, but I accepted this power under the guidance of Duo Yu, and finally became Leo Altman, fighting the magma people who invaded my home. Astra, who originally resisted this force, was also infected by the courage of her brother 1 and became a soldier. Finally, with the joint efforts of the two brothers, the president of Magma was defeated. However, although the president of Magma Star fell, his brother did not stop there. Under the siege of Leo brothers, he fled to the ground and planned to blow up L77 star. Astra was seriously injured in the battle, and Leo went underground to hunt down the lava star alone. Although he was defeated, he was allowed to reach the depths of the earth star and detonated L77 star with self-explosion. Finally, with the help of the two brothers, some surviving residents of L77 star were finally rescued. But the two brothers couldn't escape the explosion of the planet because they pushed the spaceship outside. The two were also separated by the explosion, and the life and death of the younger brother Atlas were unknown. The hometown of Leo, the star L77, known as the cosmic gem, no longer exists. Leo, who lost his hometown, went through many years of tempering before he found his so-called second hometown.