Comic book crossovers have made for some of the most enjoyable concepts in the industry, giving readers a rare look at two or more characters or teams from different worlds teaming up. Although many of these stories don't make their way into canon, they rank top of the list in the annals of some heroes' histories when it comes to their best comics. Unfortunately, some crossovers are woefully short.
Source：https://www.cbr.com/comic-book-crossovers-too-short-ranked/
