The Joker pays a visit to Commissioner James Gordon's office at Police HQ and swipes a rare art map.

Unknown to them, the singing duet have already been replaced by Joker's aides, while the Penguin is waiting in the wings to ensnare Batman and Robin.

The Dynamic Duo chase the bizarre truck, but lose The Penguin, who cleverly lifts himself off with the aid of his umbrella and an overhead wire.

Returning to the Batcave, The Caped Crusader learns the location of The Joker's hideout by analyzing the long wig left behind by Venus at the studio when she masqueraded as one of the Twins.

Venus watches in horror and regret as Joker then has the Duo tied down to an altar beneath a giant meteorite, which is rigged to fall on them when its supporting cable is severed by a revolving piece of thermite attached to a planetary mobile surrounding the great rock.