At first, I thought that when Eggman and Shadow got killed, the movie would reveal that they actually survived the explosion. But there was a post credits scene that showed that Shadow was still alive, obviously, but not Eggman. I still thought they might bring him back in the sequel, but then I remembered that Jim Carrey is retiring from acting, so that death was probably permanent and Eggman won’t appear in any future Sonic movies. Which is kind of sad since he’s usually the best character and Jim Carrey is a great actor, but also a good way to send him off.