McBain was a fictional action movie hero played by the actor and Simpsons character, Rainier Wolfcastle. The recurring action star made various appearances in Simpsons episodes over the years with random clips from the ‘McBain’ series appearing in a variety of in-episode situations and scenarios.
It wasn’t until they all aired that a fan realized all of the clips combined formed a (somewhat) cohesive storyline. So of course the good citizens of the Internet dutifully stitched all of the scenes together for all Simpsons fans to enjoy 🙂