Tom Cavanagh ("Ed") is set to play a leading role in The CW's upcoming "Arrow" spinoff, "The Flash." The Hollywood Reporter today brings word that Cavanagh will play S.T.A.R. Labs CEO Harrison Wells. Although Wells is not a DC Comics character, the name was previously mentioned on the "Arrow" mid-season finale, "Three Ghosts."

Cavanagh will join Grant Gustin as Barry Allen, 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 and Danielle Panabaker as S.T.A.R. Labs bioengineer Caitlin Snow.

"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.

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