Massive Multiplayer Crossover that involves the Singularity at the end of The Flash Season 1 opening breaches between not just Earth-1 and Earth-2, but many, MANY fandoms in the entire Multiverse, with characters from one fandom ending up in another due to these breaches, and team-ups between various Heroes to fight various villains.
http://tvtropes.org/pmwiki/pmwiki.php/Laconic/WhenLegendsMeet
FollowingLaconic / When Legends meet
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