The explanation is that this scene takes place in an inter-dimensional prison, filled with the worst convicts across the multiverse, alternate Eggmans, alternate evil Knuckles's, one panel even showed an evil alternate Cream. The Mephiles pictured is likely one from another universe.
Seriously there are a ton of cameos and parodies, from the images I've seen theres an evil Big, a muscle bound Amy, an Angry Birds bird along with Bebop and Rocksteady.
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Evil-Tree
Jun 06, 2014 at 05:23AM EDT in reply to
Gallantmon
Jun 06, 2014 at 01:26AM EDT in reply to