Just wanted to pass along this great video from Slate (a favorite time-wasting site).
…but what are the implications? All of the DC and Marvel characters inhabit a single world? What does that mean for long-term continuity? Do the Teen Titans confront Galactus when he threatens Earth? Does the Punisher try to murder the Penguin? Is the Doom Patrol jealous of the X-Men's resources and cachet? Yes, it's just a story, but for a true comic geek, it raises too many necessary questions to answer in a single one-off publicity event.
Other times, the crossover is a neat fit, and adds a welcome richness to a series's back story. Like how it was established The Golden Girls and Empty Nest occurred in the same fictitious Miami…
Cartoon All-Stars to the Rescue avoids any pitfalls (or benefits), of course, since the characters coexist only in the young man's pot-addled dream mind. In fact, as Slate's commentator points out, that's a fairly realistic scenario, someone blitzed on weed and dreaming about Bugs Bunny, the Muppet Babies, and the animated version of Alf all at the same time. This is genius.