In the Season 1 finale of The Lord of the Rings: The Rings of Power, it was definitively revealed that Halbrand was the Dark Lord Sauron. This revelation was shocking to some fans and not surprising to others given how The Rings of Power hinted at Halbrand's identity throughout the season. Given the fact that the show pulled a red herring with the Stranger, it's not surprising that fans are suspicious of Sauron's true identity.
A Rings of Power Theory Suggests Sauron Isn't Who You Think He Is
While Rings of Power revealed Halbrand to be Sauron, some Lord of the Rigs fans aren't convinced that's the whole truth.