The evil Toadman has been breeding toads and releasing them across the city, spreading chaos. A figure known only as the General responded by creating battle beasts — purpose-built home defense units that morph into toad-killing machines. The player must fight through nine increasingly difficult scenarios, eliminating deadly toads while also taking on defective renegade battle beasts that have gone off-script, building power and points on the way toward a final showdown with Toadman himself.