In "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.
The Flash airs Tuesdays at 8 p.m. ET on The CW.