The Joker's at a party. He doesn't have the outfit on, but somehow I knew it was him (this whole bit was from the perspective of if I were him). Huge party in a house in the woods, I think it was a graduation bash for some reason. Next day, one of the kids that was there goes missing. Everybody panics and splits off looking for him, and Joker packs on layers because it's cold outside, duh. Spends all day looking for the kid, nothing. This repeats for several days, with everybody but Joker getting less motivated each day.
Joker does more and longer searches than anyone, and eventually reaches the conclusion that the boy's either run away, got lost in the woods and may or may not have been eaten by a bear, or one of the above and was found by an outside party. Everybody gets mad at him for the bear suggestion and they make him leave. Joker gets really bummed because he was genuinely trying to help.
THIS IS WHERE IT GETS WEIRD, AND IS NOW BEING WATCHED LIKE IT'S A MOVIE
Details are hazy here, a lotta weird crap happened. Another party, Bruce Wayne's house, the same people from the first one are there, plus a lot more. Bruce has some new rich-guy thing to show off or something, and it winds up being an alternate power source of some kind.
It turns out it's power from what I can only describe as the Evil Dead Necronomicon (only serious rather than funny), only in the form of hundreds of little boxes for whatever reason. Joker tries to reason with Bruce (who at this point is alternating between TAS, Bale, and Clooney in different "shots") about what the power is, but he gets laughed at and shooed away.
Bruce keeps yammering on and Joker's sulking in a closet because why not. Turns out that closet is where ALL THOSE LITTLE BOXES ARE KEPT and he gets even more freaked out by the idea.
Bruce reaches the point where he's about to open one and activate it, and Joker, now hysterical, pleads for him not to. He does it anyways and total, absolute chaos ensues. The opening of one box triggers all the others to open in the closet (as well as the even larger amount in the Batcave that is only now shown), and the evil spirits start wrecking crap, going outside and causing pretty much the apocalypse. The ordeal drives Joker crazy and back to his usual self and basically everyone but him and Bruce and some nameless dude die.
The perspective of the dream is now like a horror game, You wake up in a decrepit bathroom as the nameless dude (hereafter called Steve) and bedlam has taken over the world. The mansion is dark and everything's broken, bodies everywhere. As you explore the area, Joker will pop up at random intervals to scare and mess with you, as he's now a demigod apparently because he's an agent of Chaos again.
At certain places, for no apparent reason, you encounter wraith/ghost/zombie/wight/etc. forms of your friends and family (whether they were at the party or not, go figure), and usually they ask for you to kill them to end their suffering. Joker taunts you every time regardless of your choice.
There's like a dozen or two of these instances, and each one gets more and more twisted and disturbing. However, there's an order to it, and if you screw up at all, you "restart" the whole thing and wake back up in the bathroom.
Eventually, perspective shifts to Joker in a room of nothing but screens with a chair in the center (the impression was that it was Batman's surveillance room-thing), with Joker in it. Clooney Bruce flashes on the screens sporadically, calling Joker out and blaming him. Joker explains hatefully that he tried to warn him and that nobody ever listened, how the entire thing is Bruce's fault, and how since the apocalypse drove him to madness when all he really ever tried to do was help and and do the right thing, he should rightfully let all the people who doubted and outcast him suffer. Bruce denies it and the process repeats.
Once Steve kills off all his friends and family again, he's in a huge living room with all-glass walls on one side and sees the outside damage. Total entropy, city as far as he can see is decimated. Hordes of monsters and demons are ravaging what's left. If he stays by the window too long, he'll be spotted, and a demon will suddenly appear outside the window and kill him, and the "game" resets to the bathroom again.
Once all this is done right, Joker shows up in the living room and gives a monologue about how he got tired of trying to help and decided to let the madness in.
(I remember that stuff happened here but exactly what I forget)
You beat Joker some way and he has a moment of clarity, telling you how to fix everything. You do it, and it's basically a restart button on the entire thing. Steve's back at the party, and everything's normal, with only him and Joker and Bruce having memory of it, as evidenced by Bruce's change of interest and Joker giving Steve a knowing look.
AND THEN SOMEHOW IT'S GAME OF THRONES
AND THIS ENTIRE SEQUENCE ACTUALLY FOLLOWS A THREE-ACT STRUCTURE
AND IT'S PRETTY MUCH 300, EXCEPT WITH DAENERYS AS THE SPARTANS AND NAMELESS GUYS AS THE PERSIANS
THEY'RE ALL IN THE SAME GIGANTIC CITY-LIKE STRUCTURE
DANY'S GUYS HAVE TO GET WOOD TO BURN AND GOLD FOR SOME STRANGE REASON BUT HAVE A HARD TIME SINCE NOT-PERSIANS ALREADY GOT MOST OF THE WOOD AND HAVE ALL THE GOLD
LOTS OF NARROW ESCAPES AND LUCKY MANEUVERS PASS
THEY FIND ENOUGH WOOD BUT NOT ENOUGH GOLD
IT'S EXPLAINED THAT THEY BURN THE WOOD AND DANY BREATHES IN THE SMOKE AND TURNS INTO A DRAGON THING, DON'T ASK WHY I DON'T KNOW EITHER
THE GOLD IS TO MAKE HER STRONGER BECAUSE DRAGONS LOVE THAT STUFF
THEY CAN'T GET THE FIRE TO LIGHT RIGHT AND THE NOT-PERSIANS ARE NEARLY UPON THEM
THE RETREAT TO A COURTYARD BELOW THEM AND ARE SURROUNDED
ALL HOPE SEEMS LOST
BUT WAIT, THEY FORGOT TO PUT OUT THEIR FIRE IN THE TOWER THEY WERE IN, AND THIS BIG ARMY HAS A LOT OF TORCHES
THERE IS NOW A MIRACULOUS GUST OF WIND THAT BLOWS RIGHT AT OUR HEROES AND ALL THAT SMOKE GOES RIGHT TO DAENERYS
AT THIS TIME IT IS REVEALED THE NOT-PERSIANS ACTUALLY BROUGHT ALL THEIR GOLD WITH THEM IN WHEELBARROWS PILED A HUNDRED FEET HIGH FOR WHATEVER REASON
PROBABLY TO GLOAT, THE PERSIANS WERE JERKS, THESE GUYS PROBABLY ARE TOO
DANY IS NOW A TOTALLY AWESOME BLACK DRAGON THING
AND THERE'S ALL THIS GOLD RIGHT
NOW SHE'S PLAYING WITH POWER
SHE KILLS ALL THE NOT-PERSIANS AND TURNS BACK TO NORMAL
More stuff happened I can't remember, and then I woke up.