I think this is the most comprehensive one of these I've seen: Harry Potter, LOTR, Narnia, Star Trek, Star Wars, Hunger Games, X-Men, Percy Jackson, Doctor Who, Sherlock, Wizard of Oz, SPN. And a final "amen" to wrap it all up nicely!
The ultimate modern TV cartoon crossover? Gumball/Steven Universe/Wander Over Yonder/Legend of Korra/We Bare Bears/Powerpuff Girls/SpongeBob/Adventure Time/Gravity Falls/Teen Titans/Star vs the Forces of Evil. If you know the artist let us know. by cartoonbrew