That will be depended on how Paramount's negotiation with Jim Carrey goes.
They said Paramount is currently actively pursuing Carrey to return as Dr. Ivo Robotnik in Sonic 4.
If Carrey said no the story would take a different turn.
Jim Carrey could still play the role of an alternate Doctor Robotnik, I just don't want him too.
I'd rather Shadow saves Dr. Robotnik at the last second or he somehow survived by some other means. Sonic 4 could star a brand-new villain, such as Neo Metal Sonic, and Dr. Robotnik could be revealed to be alive later or something.
If Jim Carrey doesn't want to reprise the role, then let Dr. Robotnik "
regenerate" or something.
I dunno. I just don't like the "Dr. Robotnik dies, replace him with a parallel version" take on it. It's been done before in the Archie Sonic comic and felt it was a bit of a cheap way for the comic to get out of the corner of killing off it's Dr. Robotnik.
It also implies that the war against Eggman is an impossible battle. If Sonic or the Freedom Fighters are successful in defeating Dr. Eggman once and for all, whose to say another Eggman will take his place?
I believe she'll play as Sophie's daughter instead, Lisa Rogan.
We've already been told before that the plot of the film will be based on the third installment in the franchise, The House of the Dead III, with Lisa Rogan in search of her father and Daniel Curien, who’s the son of the man who caused this mutant outbreak in the first place and who has to deal with the sins of the father.



A bit daring to skip straight to the third game for an adaption, but I like it.