A fallen angel known as Azazel is released from his prison by a shadowy figure, who enlists his help in "aiding the Redeemer in fulfilling his destiny." Camael, having been wounded in a battle with the Powers, goes to Ariel, a fallen angel who has the power to heal and who is also the leader of an organization that protects the Nephilim and the Fallen from the Powers.
Lucifer attempts to sway Aaron into redeeming him, but a vision Aaron receives on contact with his father causes him to refuse, and an angered Lucifer takes Aaron down to Hell, where he tells him of Vilma.Lucifer tells Aaron that if he redeems him, allowing him to return to Heaven to conquer the Creator, he will release his one love.Fallen stars Paul Wesley as Aaron Corbett, a good-natured high school student who discovers he is a Nephilim, human-angel hybrid.An alternate reality game advertising the series has won an interactive Emmy.Vilma, however, manages to escape from Hell, leading Aaron to the conclusion the only one trapped in Hell is Lucifer.
Outside the temple, Mazarin and the others face off against Azazel, and defeat him, knocking him unconscious.Aaron and Azazel defeat the Powers, and force Mazarin and his second-in-command to leave.When the two return, they discover Camael has been released with the help of a rat. Aaron, Vilma, Gabriel, and Azazel travel up a mountain where the Light Bringer's temple is.In Hell, Aaron and Lucifer face off against each other.Aaron defeats Lucifer, then escapes in time to redeem a severely weakened Camael, returning him to Heaven.After a battle with the Powers, resulting in the apparent death of Ezekiel, Aaron leaves his adopted family and joins Camael in order to fulfill his destiny.