After lifting the Queen's priceless collection of snuffboxes from a Londinium museum, Lord Marmaduk Ffogg and his sister, Lady Penelope Peasoup, escape unnoticed in thick fog which he creates with his large meerschaum pipe. Batman, Robin, and Batgirl are asked to help solve the robberies.

Batman and Alfred, in a cab, and Robin in the Batmobile, head for Ffogg's estate to rescue Batgirl.