While The Avengers might have had the most characters from other franchises all converging in one place, fictional crossovers are hardly anything new. But it's a tricky business -- even if two franchises share the same fans, that doesn't mean it makes any goddamned sense for the characters to show up in the same universe. Still, some absolutely insane crossovers came extremely close to happening. Like ...
5 Ghost Rider Was to Switch Places With Casper the Friendly Ghost
That is not a parody headline.
Casper the Friendly Ghost was a mild-mannered little sprite with enough innocuous charm to go around. In his Harvey Comics series, he would get into harmless adventures without any real consequences, like finding a lost dog or some goddamned thing like that. This is not to be confused with Ghost Rider, the Marvel Comics character and Nicolas Cage charity, which is a demon with a flaming skull that feeds on the souls of evil men and screams through the night on a haunted motorcycle.
Wait, the character or Nic Cage?
For some insane reason, comic book writer Ivan Velez Jr. pitched the idea of a Casper/Ghost Rider crossover to both Marvel and the makers of Casper with a full outline, possibly to silence the howling banshees in his mind. Velez imagined a scenario in which an evil villain replaces Richie Rich's father and shakes up the Harvey Comics universe so badly that Wendy the Witch casts a spell to bolster Casper's powers (what powers he possesses beyond being a joyless specter of our own mortality remains unclear).
At any rate, Wendy apparently casts too much magic and accidentally summons Ghost Rider, transporting Casper to a heroin-soaked puddle in Hell's Kitchen in his place. Casper somehow manages to thwart a bank robber, while Ghost Rider presumably rules the Harvey universe until the two finally switch places again, leaving behind a legion of young Casper fans with a literary shell-shocking usually reserved for Watership Down and Old Yeller.
"Wendy ... the shit I've seen ... the shit I've done ..."
How We Were Spared
Marvel signed off on Velez's pitch, because as the fire-peeing scene in the latest Ghost Rider movie clearly demonstrated, they do not give one single shit about making the character look ridiculous. Harvey, perhaps fearful of how fans of Casper and Richie Rich would react to a tortured servant of the devil suddenly appearing in the pages of their comics, decided to pass.
We should mention that this wasn't far removed from another batshit insane crossover premise that actually made it to print, when Archie of Archie Comics crossed paths with the Punisher, who sticks an Uzi in Archie's face while they both lament their current situation.
Frank Castle's lament takes the form of unprovoked murder.
4 Rocky Balboa Almost Joined G.I. Joe
In 1986, Hasbro decided that Rocky Balboa would be a perfect addition to the G.I. Joe universe, despite the fact that Rocky is a palsy-stricken boxer who seemed to have just enough brains to get punched in the face, and G.I. Joe is a fictional military force populated by what were essentially superheroes with billion-dollar weapon systems.
The G.I. Joe movie compromised by casting Channing Tatum.
G.I. Joe had done celebrity crossovers before, with the likes of wrestler Sergeant Slaughter and NFL lineman William "The Refrigerator" Perry (however, unlike those undulating piles of Man Jell-O, Stallone is one of the few human beings built exactly like an action figure). Talks apparently went well enough that Balboa popped up in a Marvel G.I. Joe comic, getting a dossier card complete with "facts" that include a clever mention of being the Joes' boxing instructor (which is bizarre, considering that most hand-to-hand combat doesn't seem all that useful when G.I. Joe battles were fought in vehicles so dense with laser cannons that there was barely room for a driver).
The promotional art for the Rocky Balboa figure even depicted him wielding his planned signature weapon: a stick with two boxing gloves attached to it, a weapon that virtually guarantees that Adrian will be receiving a tightly folded American flag.
"I ... shouldn't I have a gun? I feel like I should have a gun."
How We Were Spared
After a prototype action figure had been sculpted, Stallone's reps came to Hasbro demanding more money, citing the superstar's white-hot 1980s marketability (the arm wrestling vehicle Over the Top hadn't come out yet). Having grown accustomed to compensating Sergeant Slaughter and the Fridge with chocolate pies and insulin, Hasbro backed out of the deal.