A Composite Amalgamation of 616 Doom and HP Doomsday. Access to all tech and abilities.
The Heralds of Galactus (minus the Destroyer) decide to end Dr. Doomsday. Said Doctor gets 1 week of prep in Latveria and knows exactly when/where they will show up.
Bonus: 1v1 fights. No prep. Speed Equalized
EDIT: Uhhhhhhh. I dont know why the Sentry is in the title. Clearly ive escaped the old folks home again and need help. Cornstarch. Paw Patrol.
BONUS BONUS: vs. The Sentry I guess lol