The Legend of El Dorado is the fifty-ninth chapter of the manga Kengan Omega.
Fourteen years ago, "The Don Juan of Acapulco" Carlos Medel's legend began as a Middleweight. Shortly afterwards, he surrendered his belts to fight at the Super Middleweight. He wins the class again, then moves up to Light Heavyweight, then Welter and finally Heavyweight, all the while building up his body from the ground up for each class. Once he won Heavyweight, his onslaught came to a halt, as no one wanted to fight to him anymore.
Gaoh Ryuki asks why he stopped, as Masaki explains the restrictions and treatment of Carlos' strength in the professional fighting scene. Wakatsuki interjects that, besides that, Carlos' manager had a rather spotty reputation that prevented him from getting the fights that he wanted. Though there was also talk of Carlos moving on to other sports, like pro wrestling, or moving to a Japanese martial arts promotion, he simply left the public eye and moved on to the underground scene, finding a place in Purgatory. Tokita Ohma notes that Carlos' story is reminiscent of Kuroki Gensai's, both had become so overwhelmingly strong, there's nobody left to give them an equal fight.
Kaolan muses that Carlos is the only one who outranks him in the pound-for-pound ratings, and finds the tournament to be a blessing in disguise to finally meet him. Ryuki also finds out that everyone in who's in combat sports knows the name Carlos Medel, who's also revered as a God back in Mexico. Tokuno'o Tokumichi, on the other hand, notes one peculiarity about him, which Ohma realises that, for some reason, Carlos had gone down to a bantamweight since his retirement.
While Kaolan wonders why himself, he brushes it aside as emaciated or not, he's still up against a legendary boxer. Shiina Alisa steps up to referee the fight. After the two boxers get into their stances, Alisa starts the first round. Kaolan goes in with his Flash, but Carlos evades his blows by detecting his intent and dodging before he could throw them, with Agito noting that Carlos' foresight is potentially that of Kuroki's level. In the middle of Kaolan's Flash, Carlos manages to bloody his nose with a punch before he realised what happened. Carlos declares that though the Flash is lightspeed, he is faster than light.
- Tokita Ohma's name appears twice in this chapter.