Michelle Harrison Cast as Nora Allen in The Flash Series

Michelle HarrisonDeadline is reporting that "Emily Owens, M.D." actress Michelle Harrison has been cast in the recurring role of Barry Allen's mother, Nora Allen, in The CW's upcoming "Arrow" spin-off "The Flash." Fans might be scratching their heads at this one, given that Grant Gustin as Barry spoke about his mother's death in his debut episode of "Arrow." Will she appear in the form of flashbacks or perhaps a more supernatural method? Sound off with your theories below.

Harrison joins a cast that also includes Candice Patton as Iris West, Jesse L. Martin as Iris's father, Detective West, Rick Gosnett as Central City Police Detective Eddie Thawne, Carlos Valdes as Cisco Ramon, Danielle Panabaker as S.T.A.R. Labs bioengineer Caitlin Snow, Tom Cavanagh as S.T.A.R. Labs CEO Harrison Wells, and John Wesley Shipp, from the original "The Flash" TV series, in an unspecified role.

"The Flash" arrives from co-creators Greg Berlanti and Andrew Kreisberg who, along with Geoff Johns, will write the pilot episode with "Arrow" pilot director David Nutter at the helm.

(Photo Credit: Christopher Mason / WENN)