Mr. Freeze and his henchmen defeat Batman and Robin in a fight, and they haul them next door to the abandoned Frosty Freezie factory. The machinery is still working, so they are placed in two giant Frosty Freezie machines and left to be turned into frozen treats.
"Batman being made into a pineapple frosty freezie?!!"
Robin's wishful thinking of a Turkish bath saves the day. It somehow reminds Batman that frost is just moisture with the heat removed. Therefore, there must be some heat exhaust valve in the machines to create the frozen substance. Using their feet, they activate the valves, which recycles the exhaust of the heating unit of the container, and the heat transfer melts their way out.
Mr. Freeze uses a doctored photo to make Batman look like a criminal!