(CNN) It's the beginning of the end for The CW's "Supernatural."

The TV series is kicking off its 15th and final season this fall, and The CW has released a promotional poster that appears to hint at what's to come for the long-suffering, demon-hunting Winchester brothers.

The poster was tweeted out this week by the official "Supernatural" Twitter account, with the message "One last ride" -- a homage to one of the show's beloved characters, "Baby," a 1967 Chevrolet Impala.

"As it is written, so it shall end," the poster reads. It features images of the show's stars -- Jensen Ackles, Jared Padalecki , Misha Collins and Alexander Calvert -- against a backdrop of fire, angel wings, an anti-demon possession symbol and a stairway that appears to lead to heaven.

The poster is a nod to the Season 14 cliff-hanger.

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