You only gave me the words "The Mad King: episode 21". What does that mean? Was this the 21st episode of 'The Wise King'? You have to give me more information, such as what kind of work it is, what story it tells, and so on. Only then can I recommend it properly.

You only gave me the words " 60 episodes of the Savage King." That's too little information. I'm not sure if you're talking about an anime or TV series called " The Savage King " that has 60 episodes, or something else? Can you give me more details about it, like what kind of work it is, and what kind of story it tells?
In the fourth season of Journey to the West, the battle between Sun Wukong and the Mad King appeared in the seventh episode.
The anime " The Mad King of the Westbound Chronicles " was broadcasted on the QQ video platform. You can watch the third episode of " The Mad King of the Westbound Chronicles " on QQ Video.
The reason why " Journey to the West " was so popular was mainly because it was a side story of " Journey to the West ". It told the story of the young Mad King of the Ashura race, Rahu. This side story changed the main character setting of the main film, focusing on the Mad King Rahu. It described his path of growth and his struggle with the Ashura race. The audience was very interested in this new storyline, so the Mad King's Journey to the West quickly became a hot topic after it was released. Although the exact reason was still unclear, it could be speculated that the audience was curious and expectant about the new storyline and character setting, which made "The Mad King of the Western Journey" the hottest topic.
" Mad King 2 " was a comic published by Sichuan Fine Arts Press in July 2021. The editor was Zheng Jianhe and the painter was Deng Zhihui. The story described how young Youyu became the new queen of Asura and fought a battle of wits and courage with the Heavenly Gods Council. At the same time, it revealed the truth of Asura's expulsion a hundred years ago. This was the second book in the " Mad King " series, and it was the prequel to the Golden Dragon Award-winning manga," Journey to the West." In the era of the ancient gods, there were eight tribes in the world, including the Heaven Tribe, the Dragon Tribe, and the Asura Tribe. They were collectively known as the Dragon God Eight. The essence of the Asura Clan was to be fearless and fight to the end. However, they were expelled from the Heaven Realm and fell to the mortal world. The young Youyu became the new queen of Asura and was about to lead the tribe to migrate, but he was besieged by the gods. A fish showed extraordinary courage and fighting spirit. The creators of " Mad King 2 " were Zheng Jianhe and Deng Zhihui. Zheng Jianhe was a well-known Chinese mangaka and screenwriter, while Deng Zhihui was a mangaka. This manga focused on combat and depicted the Asura King's path of youth.
In the tenth chapter of the book "Mad King", the war between the Heavenly Realm and the Asura Clan began. At that time, the Wise Mad King had already gained the approval of the King of Pain, the King of Slaughter, and the King of Abyss, and had attracted a large number of followers. They decided to find a new habitat to build a new king's city. At this moment, the Heaven Realm army had descended. Although the war had affected the other races, the four kings of Asura were not afraid at all. The Wise Mad King and his men were the first to be attacked by the Heaven Realm, but the Wise Mad King was not afraid at all. He declared that he would build a capital on the corpse of the God of Heaven, turning the blood of the God of Heaven into rivers and the flesh and bones into soil. In the end, the Wise Mad King defeated the 100,000-man army, and the sword of Sakra was left behind in this land, becoming the symbol of the Wise Mad King's victory over the army.
Well, in some fantasy worlds, a'mad king' might be a ruler who has been driven insane by power, magic, or some tragic event in his life. In the'mad king got story', this king could be the central character whose madness sets off a chain of events that form the story. For example, his madness could lead to wars, betrayals, or the downfall of his kingdom, all of which are elements that could make up the story.
In the fourth season of Journey to the West, the battle between Sun Wukong and the Mad King appeared in the seventh episode.
Aegon and the Mad King (Aeris Targaryen II) were father and son. Aegon Targaryen was the son and only son of Rhaegar Targaryen and Eliya Martell. Mad King Aerys Targaryen was Aegon Targaryen's father.
The Mad King Asura was one of the characters in the manga Journey to the West. He was one of the four kings of Asura and was known as the Mad King or Youyu. The Mad King Luo Hou occupied the abandoned city and controlled the Asura Dragon Riders. He had powerful strength and had once defeated Sakra and fought with Primogenitor Lingbao. During the war with the Heaven Realm, the Mad King Luo Hou and Tathagata came to an agreement and temporarily stopped fighting and left the Heaven Realm. The story of the Mad King Asura took place in the prequel to Journey to the West, The Mad King, which described the process of him becoming the Asura King.