The CW has promoted "Supernatural" staff writers Andrew Dabb and Robert Singer to showrunners for Season 12, as Season 11 showrunner Jeremy Carver departs to work on "Frequency," a new sci-fi/drama that's just been ordered to series by the network.

According to TVLine, Singer has been working on "Supernatural" since Season 1 as an executive producer, writer and director, while Dabb joined the staff in Season 4 as a writer-story editor, before receiving the title of co-executive producer. Prior to his work in television, Dabb wrote for comics, contributing to various "G.I. Joe" series, "Ghostbusters: Legacy" and "Dragonlace Chronicles," in addition to the six-issue miniseries "Supernatural: Beginning's End" for WildStorm/DC.

Deadline reports that "Frequency" is based on the 2000 sci-fi film of the same name, and follows a police detective ("The Flash's" Peyton List) who discovers she can communicate to her father -- who died in 1996 -- through a ham radio. The site adds, "They forge a new relationship while working together on an unresolved murder case, but unintended consequences of the ‘butterfly effect’ wreak havoc in the present day."

Both produced by Warner Bros. Television, "Supernatural" Season 12 and "Frequency" Season 1 are set to debut this fall on The CW.