Mr. Freeze's henchman, Professor Frost, has invented a freezing ray. Freeze and Frost plan to use the ray to freeze Gotham City's Harbor, because they wish to steal a nuclear submarine. Batman and Robin locate Freeze's hideout, but Freeze traps both in blocks of ice. When Freeze leaves on his diabolical mission, he decides to take Robin (still frozen in a block of ice) along, just for kicks. Bat-Mite locates Freeze's hideout; soon, Batman is fully thawed and on the way back to the waterfront. Batman then attempts to save Robin and capture Mr. Freeze.