Welp, this is frightening ... 53-year-old Mike Tyson is back in boxing mode -- AND HE LOOKS LIKE A KILLER!!
A rep for Iron Mike confirms this footage was shot a few days ago as part of a promotional deal with Sony ... but damn, HE LOOKS TERRIFYING!
Just last year, Tyson told Joe Rogan he cut training out of his life completely because the adrenaline rush reminded him of the old, bad Mike Tyson ... the one he was trying to forget.
But recently, Tyson has been kicking around the idea of a comeback -- telling rapper T.