Supernatural ended after its 4th season.
Robert Singer (producer) . He is best known for his work on Supernatural where he serves as an executive producer , director and occasional writer . A fictionalized version of Singer appears in the season 6 episode The French Mistake played by Brian Doyle-Murray . Supernatural (U.S. TV series) . The fifth season concluded the series ' main storyline , and Kripke departed the series as showrunner . The series has continued on for several more seasons with new showrunners , including Sera Gamble , Jeremy Carver , Robert Singer and Andrew Dabb . With its eleventh season , Supernatural became the longest-running American fantasy series .