A look at the many reincarnations of Sauron after seeing Amazon's "Rings of Power" interpretation is Season 2, Episode 1.

Sources:

The Return of the King, Book VI, "The Field of Cormallen"

The Fellowship of the Ring, Book II, "The Council of Elrond"

The Silmarillion, "AKALLABÊTH"

The Silmarillion, "Of Beren and Lúthien"

The Silmarillion, "AKALLABÊTH"

The Fellowship of the Ring, Book II, "The Council of Elrond"

The Return of The King, Appendix B, "The Tale of Years"

The Return of the King, Book VI, "The Field of Cormallen"