This week, a new episode is waiting to be aired by The CW's fan-favorite fantasy-horror action drama series, "Supernatural." With its upcoming episode, "Supernatural" Season 12 Episode 12 spoilers and revelations have been appearing online, including one big revelation with a major character.

On the previous episode of "Supernatural" season 12, Dean Winchester (Jensen Ackles) and his memory-loss problems were featured. According to Entertainment Weekly, it was undoubtedly one of the best episodes the series have aired this season. It was reportedly heart-breaking and the events and scenarios showed were perfectly memorable.

"Supernatural" season 12's previous episode focused on Dean, but this week's upcoming episode will reportedly focus on another character who has also a significant role on the series. Aside from that, a bigger revelation this week is teased to be waiting for the fans and viewers to watch.

According to a report from Comic Book Movie, Castiel (Misha Collins) is to be put in danger in 'Supernatural' Season 12 Episode 12. The official promo released for episode 12 has teased that the Winchester brothers, Dean and Sam (Jared Padalecki), along with Castiel, will be reunited with Mary Winchester (Samantha Smith), but the events that will follow will put Castiel's life in a possible death.

This is because Mary wanted to keep secret the fact that she has been in keeping in touch with the British Men of Letters. In 'Supernatural' Season 12 Episode 12, the mother of the Winchester brothers will know the organization's real intentions, which will subsequently result in Castiel's life in danger.

Aside from this, 'Supernatural' Season 12 Episode 12, the current run will also feature Lucifer (Mark Pellegrino) returning. As reported by TV Line, Lucifer might not actually come back possessing another human body, but his presence will definitely be felt on Earth. It can be recalled that he impregnated a woman when he possessed a president's body before. Lucifer's relationship with Rowena (Ruth Connell) will also get featured when the character comes back.

"Supernatural" season 12 episode 12, titled "Stuck in the Middle (With You)" is set to air on February 16, 2017, on The CW.