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"I come from Wes Craven's twisted mind! You come from comic books that kids get when they are well-behaved at Christmastime!"
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When a franchise meant for an older demographic with copious amounts of swearing, erotica, violence and gore, and other such mature nastiness that isn't for children to witness crosses over with another franchise meant for a general audience with hardly any of those things, it results in the creation of a Demographic Dissonant Crossover.
To avoid controversy from Moral Guardians, the adult-oriented property is often Bowlderised. Though the reverse also tends to be true, where the children-oriented property is made Darker and Edgier to Avoid the Dreaded G Rating.
This is also quite common in Fan Works, as the world of fanfiction gives aspiring writers the ability to combine whatever franchises they are fans of without copyright or trademark concerns as long as the fanfiction creator doesn't profit from the fan works nor deprive the creators of the original works of revenue. Fan works, naturally, do not have to worry about adhering to network standards, and can make the child-oriented properties as "adult" as they wish to a certain degree, without attracting lawyers from the creators of the original properties, who may fear that the fan works could ruin the reputation if they become sufficiently popular and later implement a Fanwork Ban.
- The trope image comes from Multiversus. Just like A New Legacy, it's a Massive Multiplayer Crossover of Warner's franchises, and just like A New Legacy, they are not shy with mixing mature Warner franchises with more lighthearted ones. The end result is Jason Voorhees, Arya Stark, Rick and Morty and Agent Smith being playable alongside much more family-friendly characters.
- The page quote comes from Epic Rap Battles of History. In addition to the aforementioned "Freddy Krueger VS Wolverine", they also did "Joker VS Pennywise".
- Mars Attacks/Popeye
- Archie meets The Punisher may very well be the Trope Codifier. Archie also crossed over with Sharknado and Predator.
- Care Bears/Madballs.
- Captain S/The Angry Video Game Nerd. Notably, it's the first non-Cinemassacre instance of James not swearing on camera.
- Space Jam: A New Legacy became notorious for this trope: among Warner's more lighthearted franchises, you have works like The Matrix, Rick and Morty, A Clockwork Orange, Mad Max: Fury Road, and The Devils, a movie so dark Warner refuses to release it.
- The Nicktoons Unite! games cross over Invader Zim, Rocko's Modern Life and Avatar: The Last Airbender with more lighthearted Nickelodeon shows.
- Mortal Kombat vs. DC Universe.