In the last few years, connected universes seem to have become all the rage. While crossovers are nothing all that new to the entertainment industry, with popular horror icons having clashed together for decades, it's definitely become more prevalent in the last decade or so, and that's mainly due to the extreme popularity of the Marvel Cinematic Universe. Now, a shared universe is a common element across entertainment, with even video games like Titanfall having a universe connected across multiple games.