Oh, right. This might be a Christmas movie
The final scene in the trailer is a gag between both Robotniks, with Gerald shown dressed up as Santa Claus as his grandson excitedly tackles him into a Christmas tree. It’s unclear if this is a real scene in the movie, or just a little something Paramount paid Carrey to do because the movie is coming out so close to Christmas. Maybe Eggman is thinking of all the childhood family time he missed out on that made him the way he is. Or maybe Sonic 3 has a Christmas subplot.
