Pre-production for Supernatural's season 10 premiere is official underway.

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The untitled episode underwent its first concept meeting on Tuesday, and an unnamed director was set to begin surveying locations later in the day.

"EPICsode 1001 Concept Meeting starts in 5 Minutes," tweeted location manger Russ Hamilton, adding "[and then] we take our Director out surveying potential Locations...s--t's about to get real real."

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Although the director for the premiere is unknown, actor Jensen Ackles (Dean) will take the helm for episode 3. Ackles directed episodes during seasons 6-8 ("Weekend at Bobby's," "The Girl Next Door," and "Heartache") but took season 9 off due to the birth of his daughter and the long hours required when directing.

Unfortunately, the plot of both these episodes still remains a mystery despite frequent hints from the Supernatural crew. The most recent of these teasers promises and intense and surprising scene during the premiere.

"EPICsode 1001. Page 32. Scene 35. Exterior . Day. Wow! Wow!! WOW!!! Pivotal moment, possible Goosebumps," Hamilton tweeted on Thursday.

Find out more about the 10th season and Winchester brothers when Supernatural returns to The CW on Oct. 7 at 9 p.m. ET. Click the video below to see the final minutes of season 9's "Do You Believe In Miracles."

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Supernatural, Television, The cw