Per Deadline, The CW is eyeing another spinoff with a prequel titled The Winchesters, which would follow younger versions of Sam and Dean Winchester's parents.
The project is in development at the network, with Jensen Ackles set to narrate.
Danneel Ackles, who appeared on multiple episodes of the original series, is also attached to spearhead the series.
"Before Sam and Dean, there was John and Mary," reads the Deadline description.
"Told from the perspective of narrator Dean Winchester (Jensen Ackles), The Winchesters is the epic, untold love story of how John met Mary and how they put it all on the line to not only save their love, but the entire world."
Jensen and Danneel will exec produce through their company, Chaos Machine productions, which is in an overall deal with Warner Bros. TV group.