As the saying goes, when heaven is about to entrust a great responsibility to this person, he must first strain his mind, strain his muscles and bones, starve his skin, deplete his body, and mess up his actions. Therefore, if he is tempted to endure, he has Benefit from what it cannot do. This famous quote by Master Meng exactly depicts Ultraman Leo's mental journey and personal experiences in becoming the King of Fighters in the so-called Ultra World.

As Ultraman, who is not from the Kingdom of Light, although he is a prince, he is already a phoenix in trouble worse than a chicken. He came to the Earth, and by chance, he fought side by side with Ultraman Seven, and was placed high hopes on protecting the Earth by the latter. Therefore, it can be said that he is both unfortunate and fortunate.

Unfortunately, not only was his home destroyed and he had to live on the earth, making a foreign land his home, but as an Ultraman who was about to shoulder the responsibility of defending the earth, he had not received systematic fighting training; Therefore, he was often defeated by many monsters who were not very powerful. Even in the worst moment, he was cut into several pieces by the monster. The audience felt dark and cold after watching the movie.

Fortunately, he not only met Ultraman Seven who stayed on Earth first, but also received special training from him when the latter was unable to transform. These combat trainings full of actual combat level further strengthened Ultraman Leo's combat ability and level, allowing him to fully cope with the challenges of monsters; moreover, he also received ear tips from the legendary Ultra King of the Kingdom of Light in the later period. Under the command, the latter not only rescued his brother Astra, reunited the brothers (and let the younger brother assist Leo in fighting) martial arts, but also reported them as members of the Ultra Brothers.

With the help of such unfavorable challenges and favorable conditions, Ultraman Leo's growth rate is obvious to all. Of course, just like the growth experience of Ultraman warriors, Ultraman Leo not only suffered psychological shocks on earth, but also suffered thousands of injuries from his opponents. However, what is important is Ultraman Leo's spirit and will to never give up. This spirit inspired him to continuously improve his fighting ability, refine his fighting skills, and eventually became the strongest king of fighting.

Since then, Ultraman Leo has become a famous star in the Kingdom of Light. Although he has experienced hundreds of battles, he has rarely suffered defeat.