Executive producer Stephen Broussard and Marvel Studios president Kevin Feige confirmed the news, reported Digital Spy.
"We will take audiences through a sort of a guide to the multiverse, other dimensions, and there are amazing things out there - wonders that are going to be hopefully visually extremely interesting and unique to this movie," Feige said.
"But there are also very scary things in these other dimensions. Mads' character is a sorcerer who breaks off into his own sect. (He) believes that the Ancient One is just protecting her own power base and that the world may be better off if we were to allow some of these other things through," he added.