Gotham is still under the rule of Edward Nygma, needing someone to stump him with a riddle in order to set the city free, and Lucius Fox believes he can be the person... Well, he can try at least, as him recording a message to be left for his son Luke signifies his confidence in his ability to come up with a riddler to stump a man called the Riddler... but he gets recruited into a better idea to save the city.
Obviously, when we're talking saving Gotham, Batman comes into play, and he brings Lucius Fox into a meeting with James Gordon and the government agents that were sent into Gotham. They're planning on doing the whole trace the call thing on the monitor Riddler uses in his daily broadcasts, only problem is, they're going to need to keep the Riddler talking and broadcasting for a quite a few minutes for it to work. But this is Batman, and he's always got a plan.
So dusk falls, and it's time for Riddler to issue his daily challenge, and on cue, Batman appears to ask the Riddler a question. Riddler thinks it'll be a riddle about bats, but Bruce does the classic "who am I?" riddle, and clearly starts describing Riddler as a smart kid who no one paid any attention to so he's overcompensating in his adulthood. Riddler takes his turn at being a "couch doctor" and tries to describe who Batman is under the cowl, but misses completely. Regardless, despite thinking the attempt at an insult is cute, Riddler drops Batman into his pit, where there's quite a few hungry lions.
With things seemingly gone bad, Lucius and Gordon believe they should abandon trying to tap into the network and help Batman, but they're told to keep going, while Batman fights off the lions, which Riddler watches, thus keeps the feed going, giving Lucius enough time to track Riddler's signal. Then after the lions are beaten, Riddler drops a bunch of cars into the pit, but Gordon saves the day!