Castiel is Acting a Little Strange on Tonight's 'Supernatural'

Castiel (Misha Collins) chats with Dean (Jensen Ackles) in this still from tonight’s all-new Supernatural.

In “Into the Mystic,” Sam (Jared Padalecki) and Dean investigate a case where people are suffering violent deaths after hearing a mysterious song.

In the trailer for the episode, Sam and Dean are a little worried about Castiel’s behavior as of late.

“There’s something a little off about him,” Dean says. “It scares me.”

Watch the promo below!

Supernatural airs TONIGHT, January 27 @ 9PM on The CW.

15+ Supernatural stills inside…