The exciting return of Jim Carrey to the Sonic films is great news for Sonic the Hedgehog 3, but it may be a problem for the movie's other villain. Jim Carrey will return as Dr. Robotnik in Sonic 3, which will undoubtedly be a big boost for the film. There was uncertainty around the actor reprising his role after announcing his retirement two years ago, but Carrey will officially be part of the third Sonic the Hedgehog movie. Dr. Robotnik was the primary antagonist of the first two films, making Carrey's return all the more important to continuing the story.

https://screenrant.com/sonic-the-hedgehog-3-jim-carrey-robotnik-shadow-villain/