Speaking to IGN, Sonic movie writers Pat Casey and Josh Miller ... when they're going through the snowy mountains to the cave, we had a bit, because Sonic 2 was sort of an Indiana Jones," says ...

(There's no spoilers here for the new movie, we should add.) In Sonic the Hedgehog 2, Big the Cat would have popped up in skeletal form as Sonic passed through a cave. Within it, viewers would ...