To find a device that will let them administer the meta cure to Cicada, Barry and Ralph go undercover to get it from a black market arms dealer. Meanwhile, Iris decides to go looking for Cicada on her own, and Sherloque meets a woman after his own heart.

The team need a meta to test the cure on, and settle on King Shark. Grodd escapes from ARGUS captivity and initiates his own plan to rule Central City... and then the world.