Supernatural Season 10 Spoilers: Is The Real ‘Monster’ Demon Dean Or Sam?

New "Supernatural" season 10 spoilers reveal that Sam will have to do some "questionable things" to find his brother, and the audience will soon wonder: who's the real "monster," Demon Dean or Sam?

TVLine reports that new "Supernatural" season 10 spoilers reveal that the last thing Demon Dean wants is for his brother to find him and ruin his "womanizing party animal ways," so he's trying his best to stay hidden.

However, Sam stop at nothing to find his older brother, leading him "to do some questionable things that will make him, and certainly the audience, wonder which one of these guys is the true monster," executive producer Jeremy Carver said.

Dean will have to decide "how dark and what kind of demon he's going to be," Carver added.

Actor Jensen Ackles (who plays Dean) says his character will be "an ultra version of a womanizing party animal."

Meanwhile, Castiel is back on Earth and trying to get his angelic grace back. He'll also be the harsh "voice of reason" when it comes to Dean's situation, Ackles said.

"Even though it might be hard to hear, it might be hard to say, he tells Sam, 'Listen, you know what you have to do if things don't go right.'"

According to Hypable, the "Supernatural" season 10 synopsis reads: "Season 10 begins with Sam's frantic search for his missing brother, who is gone without a trace. The road to recovering the wayward Dean takes Sam down dark paths, with consequences that will shake the boys to their core. Meanwhile, Castiel has to pick up the pieces in the aftermath of Metatron's campaign. With his grace failing and rogue angels still on the loose, Cass will face the ticking clock of his own mortality as all-new threats emerge to once again push all of our heroes to their limits."

And for those who have forgotten what happened last season, a recap synopsis reads: "Last season, power struggles in Heaven and Hell would push the boys beyond their limits. Crowley was pitted against the Knight of Hell, Abaddon (Alaina Huffman), in a civil war for the throne of Hell, while the recently fallen angels formed battling factions, with the boys and Castiel caught in the crossfire of both conflicts. Meanwhile, the egomaniacal former scribe of God, Metatron (Curtis Armstrong), vied to replace the Almighty in the hearts and minds of angels and humans alike. However, absolute power corrupted the scribe, and the brothers were forced to confront the would-be deity, a conflict ending with the death of Dean Winchester. In the shocking final moments of the season, he would be resurrected by the power of the First Blade, opening his eyes to reveal he has been transformed into a demon."

"Supernatural" season 10 premieres Tuesday, October 7 at 9:00 p.m. ET on The CW.