Doom (Galactus) vs The Fourth Host and Mad Celestials

Doom with 1 week of prep vs Celestials

Well Doom tanked the Mad Celestials for what was it? 27 minutes with just him and his armor in a spur of the moment thing to let the FF escape. I would go with Doom on this with Galactus' power.

But that would be a lot of celestials to take on even with G's power.

Worst case scenario: The Mad Celestials fuse. Doom gets one-shotted.

Doom does what Doom does levels up and takes control of the multiverse, leading to a crisis type event in Marvel.