Official Synopsis:

“King Shark” — (8:00-9:00 p.m. ET) (TV-14, LV) (HDTV) 

“ARROW’S” DIGGLE (DAVID RAMSEY) AND LILA (AUDREY MARIE ANDERSON) CROSS OVER TO “THE FLASH” TO TAKE ON KING SHARK –When King Shark escapes from an A.R.G.U.S. holding tank, Lila (guest star Audrey Marie Anderson) and Diggle (David Ramsey) travel to Central City to warn The Flash (Grant Gustin). King Shark shows up at the West house and attacks Joe (Jesse L. Martin), Iris (Candice Patton), Wally (Keiynan Lonsdale) and Barry. Hanelle Culpepper directed the episode written by Benjamin Raab & Deric A. Hughes (#215). Original airdate 2/23/16.