In the episode, God is severely wounded while Amara is now going ahead with her plans to destroy the world while Sam and Dean have a last chance to stop her.
[1] The episode also introduces Elizabeth Blackmore as Lady Antonia "Toni" Bevell, who was announced to have a recurring role in the show's twelfth season.
In London, Lady Antonia "Toni" Bevell (Elizabeth Blackmore) is notified by someone about the recent events, where she is revealed to have been looking for Sam and Dean.
Back in the bunker, Sam proposes that they kill Amara (Emily Swallow) as the only way to bring balance to the universe as God is dying.
As He's dying and the Book of the Damned can't cast a spell like that, Castiel proposes that the souls of humans may be enough to make it happen.
Meanwhile, Dean tries to find his way back to civilization and discovers Amara's gift to him: a confused and resurrected Mary Winchester (Samantha Smith).
Matt Fowler of IGN gave the episode an "okay" 6.4 out of 10 and wrote in his verdict, "'Alpha and Omega' stumbled hard because there honestly couldn't be any other outcome to the Amara storyline other than a total truce.
"[7] Sean McKenna from TV Fanatic, gave a 2.7 star rating out of 5, stating: "I was definitely wondering where Supernatural could possibly go after tackling the Darkness, but maybe bringing the battle back to Earth, and not on such a massive scale, might be a good thing?
"[8] Bridget LaMonica from Den of Geek, gave a perfect 5 star rating out of 5, stating: "In expected cliffhanger fashion, we're left with a couple loose ends, but this season had a different flavor.
), the season-long battle of darkness versus light ended with hand holding, family therapy, and a pillar of yin and yang smoke.
"[10] MaryAnn Sleasman of TV.com wrote, "'Alpha and Omega' was one of those finales that changed the landscape of the Winchesters' world but didn't also try to replace one big bad with another.