Rouge the Bat was considered for all three Sonic films. For whatever reason, the writers have just never been able to make her work. Big the Cat almost made a cameo too... as a skeleton in the ...

Miller eagerly agreed, joking, “Yes! In Sonic the Hedgehog Part Ten! Finally.” “Big the Cat is our Thanos, you know?” Casey added. Well, at least we know how "Sonic: Chaos War" will begin ...