Katie Cassidy To Return For 'Arrow's 100th Episode

Check out the new poster for Arrow season five!

Showrunner Marc Guggenheim just teased a table read from the 100th episode — which is at the center of the four show crossover with DC’s Legends of Tomorrow, Supergirl and The Flash.

Katie Cassidy and Jamey Sheridan will also return for the episode.

In the upcoming season, the newly appointed Mayor Oliver Queen (Stephen Amell) finds himself challenged as he fights on two fronts for the future of Star City. With Diggle (David Ramsey) back in the military and Thea (Willa Holland) adamant about hanging up her hood as Speedy, Team Green Arrow is down to just Oliver and Felicity (Emily Bett Rickards) � but they’re no longer the only vigilantes in town.

Arrow returns on Wednesday, October 5th on The CW. Watch the extended preview on JJJ now!