Doctor Gloom and General Blight plan to take over the world as soon as they have disposed of Bananaman. As Bananaman tries to stop them he is turned into a baby by Doctor Gloom's ray gun.
With the help of underground criminal The Mole, the Heavy Mob break out of jail and escape through an underground tunnel. Bananaman follows in order to dispose of the Mole and capture the Heavy Mob.
