The Beyonder is a character from the Marvel Universe who was first introduced in the "Secret Wars" series in 1984. He is an extremely powerful entity that hails from a dimension outside the known multiverse, and his existence is based on the quest to understand the nature of human beings and their emotions. The Beyonder has the ability to manipulate reality on a vast scale, allowing him to alter time, space, and the laws of physics. His power is so vast that he can rival gods and other cosmic entities in the Marvel Universe. In his most well-known story, the Beyonder brings together various superheroes and villains to participate in a tournament on a distant planet, setting off a series of events that explore themes of power, desire, and morality.
Over the years, the character has been reinterpreted and has had various depictions, but he is always associated with his immense power and curiosity about humanity. He makes his first appearance in the cancelled third part of Disney Vs Marvel Villains War revealing that he is the creator of the villains wars multiverse, later, he has other appearances in the other wars, being a mysterious entity with intentions not yet revealed but with suspicions that he is plotting something big at hand.
Disney Vs Marvel Villains War - Part 3[]
If the war wouldn't have been cancelled, Beyonder and Anubis would have been Horsemen of the Apocalypse waiting in the wings but would have gotten usurped and their powers stolen towards the end by Team Thanos.