Another new episode of "Supernatural" season 11 airs tonight and fans should expect a series of violent deaths related to an eerie song.

According to the synopsis from Futon Critic, brothers Sam (Jared Padalecki) and Dean (Jensen Ackles) will dig deeper into the case of people who meet their demise in a violent manner after hearing a mysterious song.

Meanwhile, a scene (shown below) from the episode was released and it shows Dean talking to Hildred Harper (Dee Wallace), who advised him about the secret to a "long and happy life."

According to Hildred, the secret is to "follow your heart." "You do that, all the rest just figures itself out," she tells Dean. The scene ended rather funny, especially when Dean didn't expect something like that could happen.

When Dean does not hear about life lessons, he will also be busy dealing with Castiel (Misha Collins).

Elsewhere in the episode, Dean finds that there is something strange about Castiel, who appears to be behaving differently. Has the Devil taken control of his body? Based on the episode preview, Castiel is not his normal self that it was also seen how Dean told his brother that something was off about the angel.

Another angel was also shown slowly walking behind Castiel as if ready to attack him and called him Lucifer. But Castiel/Lucifer had the upper hand and made the other angel disappear. Has Castiel lost his body to the Devil?

Fans will just have to wait for tonight's episode to get the answer. Another thing to watch out for in the upcoming episode is the attack on the Winchester brothers and a bloody Dean.

Titled "Into the Mystic," the next episode will have Wallace and Shoshannah Stern as guest stars.

"Supernatural" airs every Wednesday, 9 p.m. EST on The CW.