Magic can certainly happen in the recording studio, but with some collaborations, a witch's brew with a horrid stink can also boil over. Huge, lottery-sized paychecks evidently blinded the poor fools involved from seeing what truly awful things they were creating. Where's Marty McFly when you need him? If only he could go back in time and pull the plug on these unholy unions. Keep reading for the ten worst collaborations in metal.
See also: The ten most disappointing metal albums