AN EPIC AND AWESOME RESPONSE FROM VEN BLACK!

VEN BLACK -

Riiiiiight, now that I'm not in a slight hurry to go to the shops, this is the rough way I see this panning out.
They all "appear" on the battle ground, Dr Manhattan knows Superman (both DC), and thinks he is the greatest threat, turns his blood into Kryptonite, the last son of Krypton dies.

Thor knows Scarlet Witch (they are both Avengers), and he knows Dark Phoenix...and he wants NOTHING to do with that shit, and while he would go for the man who seemingly killed another dude with a look, Dr Manhattan is still naked, so Thor charges Omni-man, and an Epic fight breaks out.

Scarlet Witch and Dark Phoenix know each other, and they both know if they are going to survive this, they have to take the other out as soon as possible, however Dr Manhattan goes to get in the way of this, his first and only mistake of this battle, Scarlet Witch turns him back into a normal man, and Dark Phoenix disintegrates him with the fires of life and death.

Meanwhile, Omni-man puts up one HELL of a fight, however Odinson has the upper hand in terms of pure power, and combat experience, meaning after a herd fought battle, Omni-man ultimately is decapitated by Thor.

Thor looks to the battle of PURE power happening between Starlet Witch and Dark Phoenix, at his heart he still really wants FUCK ALL to do with that, but he knows one good God Blast could possibly take them both out, he powers up and fires with a blast that would make Goku proud...unfortunately, he is firing at two OMNIVERSAL level threats, one is the incarnation of life and death, the other is a reality warping, chaos magic throwing, MASTER of probability.
Wanda and Jean look to the coming blast, and turn that fucker round quicker than you can say "bugger!" Thor is rendered into a mist of white hot subatomic particles...but it was a glorious death.

This is where things start to get weird and metaphysical, The Dark Phoenix using all the power at her disposal, tapping into the wellspring of life yet unborn, to power her MORE than deadly abilities, and The Scarlet Witch using her magic, her abilities as THE Nexus being, and her mastery of altering probabilities to almost always be in her favour.

The battle lasts for days, scorching the universe around them, but ultimately Dark Phoenix starts to feel her power wane, as she uses up the last visages of life yet to be born, and with a defiant scream she is turned to dust.

The Scarlet Witch stands in a universe where no life exists, and no more life to be born...it is a hollow Victory, well it is until she alters reality, and brings everything back to life, and where it is supposed to be, this battle nothing more than a fading memory.

The End.