After reading through the first appearance of Doomsday, I was thinking: What would have happened in the Marvelverse had he just appeared in Ohio and started blazing his way towards Manhatten?
So here's the scenario. The conditions start off exactly the same as it did in DC. Mysterious monster appears in Ohio and starts wrecking things, moving in a b-line towards New York. He starts off just as he would normally (One hand behind his back) and in his green suit.
For the Marvelverse, since this was right after the DC reboot, the Marvel Universe is in it's classic form. No Odinforce Thor, no Uber-Reality controlling Scarlet Witch, etc etc.
Who would be the first to arrive on the scene? When would his other arm come out? Would he make it to New York? Who would be casualties? And how would they stop him... if they can?
Avengers: Thor or Hulk would arrive on the scene to confront him and be the "main guy" to take him down. They'd also likely have the likes of Wonder Man, Hercules, She-Hulk, Iron Man, Quicksilver, Scarlet Witch, Vision, and others running interference, coordinated by Cap.
Fantastic Four: Reed plot devices his way to victory.
X-Men: They might get their collective asses kick, save some Phoenix shenanigans.
Reed use his krypto-blaster, the gun he was working on earlier, just before the attack, and that he didn't tested, to blast Doomsday's **** off. And it works. Because it's Reed's work.
Avengers: Uge gangbang from the team, with either Thor or Hulk getting his face stomped, than the other arrives, and they win. OR either Thor or Doctor Strange send him in another dimension
He could destroy some street leveller for the first few hours should they mistake him for a generic brick. Some Casualties, he tussles with the Avengers which may or may not be defeated at first go.
Then at second go, this could happen
1.) They consult Reed who then promptly gives them a deus-ex machina and tell them to scram. Said gun pwns Doomsday
2.) They get Hank Pym to shrink him down to pint size and then bfr him somewhere in space.
3.) They get Wanda's to Hex him causing his adaptation's probability to get ****ed and own him.
4.) and craploads more bfr options.
At first, he would be treated as a regular bad guy and get confronted by some mid-level heroes. It wouldn't be until he killed a few, that the big guns would show up.
If Hulk showed up, at first he would get his head handed to him, because he would probably underestimate the newcomer, do to unfamiliarity. Not knowing what to expect, DD's speed and strength and ferocity would catch Hulk off guard. Since you know I am not playing favorites, I think it would catch Thor off guard at first also.
Later fights, once the threat is known, might play out differently, but that is a different thread.
Heroes rarely throw their worst weapons or attacks at a character unless it is a last resort. So, I would imagine that there will be a lot of bodies laying around before the likes of Reed and Pym bring out the shiny devices, or before Hulk starts using his Hulk/Banner/Cunning/Intelligence mix, or before Thor starts using his Solve-Any-Problem-Magic-Hammer tricks.
But, since this would be a life and death scenario, it would escalate quickly.
X-Characters have some heavy threats in the bullpen, but I really don't see any of them that would be able to handle DD at the early stages of the battle.
FF have characters that are either durable enough, shielded enough, or distanced enough to survive the initial melee.
Avengers, though powerful, will lose some people, right along with the X-characters in the beginning.
Stark will go in and initially have his armor peeled off of him. He might live through it, he might not. If he lives, he will be back with something more powerful and tricky.
After waking up, Thor or Hulk will change strategies and any battles with DD will quickly become close combat, feral and very destructive to the surrounding area. I don't think DD will allow time for a bfr, a thunderclap, etc. He does not stand around, posing and threatening as many powerful villains do. He goes right in, again and again.
While all of this is happening, Dr. Strange may be preparing something wicked and Doom may have tuned in on some sort of display out of harms way. Reed will be going through his closet, as will Pym.
In the end, it will probably look something like this:
Ben, Thor and Hulk pound it out with DD as he speeds around them, then jumps in for the attack. They will live through it and keep him busy, if they don't outright destroy him.
Meanwhile, Strange, Pym, Doom and/or Reed will be setting up some sort of game-changer. Doom may be involved, simply because DD could end up becoming a threat to his plans.
Whatever happens after this, will happen on top of a heap of costumed bodies and in the smoldering ruin of a former city, state, or continent.
Doomsday is old school and he isn't beating Hulk...at all. Also, Hulk never underestimate his opponents and Doomsday would have to literally POUND on him in order to win this and with Hulks on durability and healing factor, I can't picture Hulk falling. Maybe if this was Savage Hulk an argument can be made but any recent Hulks, hell no.