Let's see who can kick Dr. Manhattan's (Jonathan Osterman) butt in all of DC/Marvel universes -
Dr. Manhattan vs Dr. Strange
Dr. Stranger is the master magician from the Marvel universe and at different levels controls all magic and mystical.Can Dr. Strange do anything against Dr. Manhattan -
Dr. Strange can possible teleport Dr. Manhattan to some pocket dimensions but Dr. Manhattan can teleport himself right back.
Dr. Strange can possibly destroy Dr. Manhattan's "body" magically but Dr. Manhattan can rebuild it again. (Remember that Dr. Manhattan can come back from dead) Further, Dr. Manhattan will always know beforehand what Dr. Strange is going to do and can protect himself easily!
How can Dr. Manhattan kill Dr. Strange -
What works in Dr. Manhattan's favor is that he can come back from dead! So even if Dr. Strange "kills" Dr. Manhattan, still Dr. Manhattan can keep coming back eventually killing Strange.
Dr. Manhattan can essentially turn any type of energy into a weapon against Dr. Strange. So whatever magic Dr. Strange might use, Dr. Manhattan can negate it and turn it back onto Strange.
Dr. Manhattan has an endless supply of powers but Dr. Strange doesn't so after Dr. Strange has used up all his magic, Dr. Manhattan can dispatch him (probably after coming back from dead multiple times)
Verdict - Long drawn battle and Strange might be able to temporarily defeat/kill Dr. Manhattan but Dr. Manhattan will keep coming back until Dr. Strange is all out.
Dr. Manhattan vs Doomsday
Doomsday is perhaps the strongest DC Villain with the
Can Doomsday do anything against Dr. Manhattan - Nothing. Nada. Doomsday's physical strength is useless against Dr. Manhattan so he can't hurt Dr. Manhattan in any way.
How can Dr. Manhattan kill Doomsday -
Dr. Manhattan can kill Doomsday in multiple ways - Blunt super strength, intrinsic field removal etc but Doomsday can most probably rebuild himself each time.
Dr. Manhattan can lock Doomsday in some time loop from where Doomsday can never escape. By doing this, Dr. Manhattan would ensure that Doomsday doesn't become resistant to Dr. Manhattan's powers (as Doomsday will be imprisoned and not killed).
Verdict - Although Dr. Manhattan can easily kill Doomsday in a variety of ways, Doomsday will come back stronger so Dr. Manhattan won't kill him. Instead, Dr. Manhattan will imprison him in some time loops.
Dr. Manhattan vs Galactus
Galactus is the most primitive force of nature surviving the big bang and uses the cosmic energy itself as his power source. Galactus falls into the category of gods in Marvel universe.Can Galactus do anything against Dr. Manhattan - Using cosmic energy, Galactus might easily hurt Dr. Manhattan as it's unclear how Dr. Manhattan's body responds to cosmic attacks. But again, Dr. Manhattan can rebuild himself, so Galactus' will eventually run out of energy.
How can Dr. Manhattan kill Galactus -
Dr. Manhattan can spontaneously create the universal nullifier and kill Galactus with it (Nullifier is the only weapon that can kill Galactus)
Dr. Manhattan can destroy all surrounding galaxies that have "edible" planets and let Galactus starve to death! (Galactus needs planets to survive)
Dr. Manhattan himself can attack Galactus with cosmic energy.
Verdict - Galactus might fight back but Dr. Manhattan has many easy ways of killing him.
Keep reading next battles -
Part 1 - Dr. Manhattan vs Superman and Hulk
Part 3 - Dr. Manhattan vs Silver Surfer, Dark Phoenix and Professor X
Part 4 - Dr. Manhattan vs Mr. Mxyzptlk, Scarlet Witch and Mr. Fantastic
More about Dr. Manhattan -
To find how Dr. Manhattan became so powerful, click - Dr. Manhattan's Origin and Superpowers
To find some funny details about Dr. Manhattan's personal life, click - Dr. Manhattan's personal life and his girlfriend Silk Spectre
To read some of Dr. Manhattan's memorable quotes, click - Dr. Manhattan's memorable quotes from Watchmen
To find about other Watchmen character's super powers and super craziness, click - Watchmen character's super powers and super craziness