The Batman

Joker, Batman's nasty adversary, has developed a gas with which he can take over the whole of Gotham City with a smile. He first tries it out on inmates in an asylum. Batman tries to catch him in the asylum, but the Joker manages to escape. After a few detours, Batman finds the Joker's hiding place, who manages to escape with the help of a balloon. Batman suspects that the balloon is not filled with normal gas, but with the Joker's evil laughing gas. A showdown ensues, and - how could it be otherwise? - Batman saves Gotham City at the last second.