The actor announced via his Twitter feed that he will star in an upcoming episode of the paranormal drama.
He wrote: "Back in Vancouver, to do Supernatural! I should move here."
Roché confirmed in a previous Twitter post that he will also be reprising his Fringe role as villainous shape-shifter Thomas Jerome Newton.
Supernatural will return on September 24 to The CW. The third season of Fringe will premiere a day earlier on Fox.