The Rings of Power showrunners have confirmed that they're considering the Dark Wizard to be one of the Blue Wizards, which means the show will be interpreting one of Tolkien's lasting mysteries.

So if the Dark Wizard is not Saruman who could he be? He could be one of J.R.R. Tolkien’s ill-fated Blue Wizards of the Second Age. From the moment he arrived on Middle-earth, all signs pointed ...