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The post-credits scenes from Sonic the Hedgehog 3 painted a pretty clear picture of what the fourth film would be. The first scene saw Sonic fighting an army of Metal Sonics, only for Amy Rose to show up and save him, while the second scene teased that Shadow was still alive. These two scenes caused tons of speculation that the fourth film would adapt the story of Sonic CD, with Sonic and Amy teaming up to fight Robotnik and Metal Sonic.
Jim Carrey, Keanu Reeves, & Matt Berry Have Joined The Cast Of Sonic 4

Alongside the teaser, a cast list for Sonic the Hedgehog 4 was released, confirming several key characters. Most surprisingly, Jim Carrey is returning. Carrey previously played Ivo Robotnik in all three of the Sonic films, with him also playing Gerald Robotnik in Sonic the Hedgehog 3. Both of these Robotniks seemingly died at the end of the third film, meaning that Sonic 4 will have to explain why Robotnik is back. This lends more credence to the time travel theories, as this would be an easy explanation.








