In Earth-9997, the "Skull" is not a Nazi war criminal, but a teenager named Benny Beckley who gained massive psychic powers from the Terrigen Mists. He wears a simple skull mask and a ragged leather jacket, but his power allows him to mind-control entire populations.
He serves as the antithesis to Captain America, leading an army of mind-controlled "heroes" to dismantle the last remnants of American democracy.