Batman Issue 160

The Mystery of Madcap Island!
Batman and Robin trail the Green Hood Gang to Madcap Island, a place dotted with wealthy men’s summer homes, all built in the symbol of a business firm or an object someone wanted to base a house on.

The Alien Boss of Gotham City!
Batman and Robin seem stymied by the otherworldly weapons of the Gimmick Gang, whose leader is unmasked as an apparent alien.

Individuals

 * Batman
 * Robin
 * Green Hood Gang
 * Gimmick Gang

Locations

 * Gotham City
 * Madcap Island