"Gorilla Grodd's devolution device is fused with an advanced explosive. Investigate the techniques of Grodd's science before he devolves the entire city."
An army of intelligent gorillas has descended upon Metropolis' Little Bohemia District. Servants of Gorilla Grodd, these apes have installed and protect a number of devolution units and neural arrays, all designed to devolve the city's populace into simians under the mental control of their master. To further protect his devices from tampering at the hands of the city's defenders, Grodd has installed an explosive of his own design in each device.