8 Years Ago, The Perfect TV Crossover Episode Combined 62 Years of Lore (And It Should Happen Again)

Sam and Dean Winchester in Supernatural looking out a window. On March 29, 2018, a major TV show took a risk with a completely unexpected crossover episode, and not only did this bold move pay off, but it should also serve as an example of just how brilliant (and fun) crossover episodes can be. Supernatural was on the air for an impressively long time.