The joke was on me!
This is a fighting game based on the Batman Beyond spin-off, which I had never heard of before. As Batman, you punch and kick your way through mostly side-scrolling levels and must stop the Joker from carrying out some nefarious scheme. There are four different suits to choose from which each have strengths and weaknesses, such as the offensive suit which has good attacks but a weak block. There are cutscenes in between levels which tell the story, which consist of stills and text.