"How To Hatch A Dinosaur"
After narrowly escaping last time, Olga and Egghead enter the Gotham City Radium Centre and steal two pounds of radium. They plan to use it to hatch a forty-million year-old neosaurus egg that they also steal. Egghead hopes that the powerful neosaurus will help him take over the entire city. But Batman tricks them into surrendering by coming out of the egg in a neosaurus costume and scaring them into the paddywagon waiting outside.
Batman displays even more foresight than usual, when he somehow manages to be inside the egg in costume while it was in plain view of the Cossacks the whole time.