Supernatural's Sam and Dean will take a terrifying trip down memory lane in season 11.

'Shadowhunters' TV Show: Michael Wayland Cast? 'Supernatural' Alum Rumored To Take Role

The Winchester brother's have lost almost every one they've ever held dear, and then some. With the Darkness out in the world once more, the boys will find themselves toe to toe with some old familiar faces.

"As responsible as the boys feel for having released The Darkness and how much they personally want to defeat it, they're not going to be able to do it alone. They're going to have to confront some figures from their past," executive producer Jeremy Carver said, according to TV Line.

'Supernatural' Season 11: Dean Will Get Visions As Well? Jared Padalecki Drops Shocking Teaser

These confrontations will lead Sam (Jared Padalecki) and Dean (Jensen Ackles) to create some questionable partnerships as apocalypse 2.0 ramps up.

"They're going to have to make some unexpected and unholy alliances involving folks from their past, which will have personal ramifications, as well - because these are some pretty significant figures from their past," Carver teased.

Who do you think will come back as Supernatural enters its second decade? John Winchester? Jo and Ellen? Bobby? Sound off in the comments below!

Supernatural will return to The CW on Oct. 7 at 9 p.m. ET. Check out a season 11 preview below.