This is based on opinion. Please don't list it on a work's trope example list.
Nightmare Fuel / Fear Itself
The fate of Paris. Grey Gargoyle, one of Iron Man's old foes, is upgraded into Mokk, Breaker of Faith. He uses his supercharged powers to turn essentially everyone in Paris into stone... and then starts crushing them. When he fights Iron Man, the fight keeps shattering more and more people. When Iron Man gets beaten by Mokk the first time he awakens to find himself surrounded by a mountains made up of the broken pieces of petrified people. Keep in mind that Gargoyle's powers have proven to be reversible, so Stark feels the pressure to defeat Mokk quickly, but... It's enough to cause Iron Man to start drinking again.
Even with all of Earth at battle, it all comes down to Captain America, a magic hammer and some farmers in a truck to make a last stand for all the marbles.