Following the break-up of the Ultra-Humanite's operations on Gorilla Island, Grodd is keen to re-assert his dominance as Head Ape in Charge. During his last failed attempts at conquest, STAR Labs confiscated much of his devolution technology which Grodd is now keen to re-claim and implement. His associated commission you to interfere with STAR operations, steal their technology and ultimately join Grodd in an assault on the STAR lab research facility in Midtown Metropolis. Can he do it before the arrival of the two heroes known as The Flash? Can they stop him before he turns they and the world into apes?