Ask a student to set the stage of this episode. That's pretty basic right. Ask your students to brainstorm about things that could get in the way of Batman achieving his goal. Here are some basic probable responses. Batman's car breaks down in the chase.
Batman catches a cold and has to stay in bed for a week.
Batman breaks his leg going down the Bat pole and has to get around in a wheel chair for a couple of months. The Joker catches Batman and Ties him up. The Joker catches Robin and Batman has to free Robin, then go out and Catch the Joker. The Riddler shows up to help the Joker and Batman has Double trouble. The Joker tells everyone that Batman really committed the crime in question.