The Veronica Mars alum, who currently stars on CW's Ringer, will be playing Chronos, the God of Time. (Odd coincidence? Misha Collins, the man who played Supernatural's former "God," Castiel, is set to guest-star on Ringer.
Dohring will appear in Supernatural's 12th episode, slated to air in mid-January.
Supernatural airs Fridays at 9/8c on The CW.