Highly educated characters vs Everybody
Doctor Reed Richards
Doctor Strange (Classic)
Doctor Fate (one of the decent versions)
Doctor (Authority - Habib)
Doctor Doom
Doctor Hank Pym
Doctor Bruce Banner
Doctor Light (Hoshi)
Doctor Voodoo
Doctor Manhattan
Doctor Who
Doctor Will Magnus
Doctor Nathaniel Essex (Mr. Sinister)
Professor X
Professor Zoom
Professor Ivo
All working together and cooperating fully to try to achieve these goals (prep only if specified). No using going back in time to get infinite prep or to kill opponents as babies etc.
On earth:
1) Stop WWH when he was on his rampage of revenge.
2) Conquer Wakanda within 24 hours.
3) Capture or kill Apocalypse, who is lurking in his base.
4) Permanently stop Doomsday when he was on his rampage in DOS.
5) Destroy all vampires on Marvel earth (with no human casualties) within 1 month.
6) Enter the Zombieverse. Once there proceed to destroy every last remaining super-zombie on earth then get back safely.
7) Take over Marvel and DC earths (separately, with no warning for earths at the start of their campaign, no outside forces alllowed, only regular earth-based characters).
Into space:
8) Defeat the Cosmic Avengers - Nova, Quasar, Gladiator, Silver Surfer, Ronan, Beta Ray Bill (1 hour prep).
9) Capture or kill Thanos, who is scheming away on board Sanctuary (5 days prep, Annihilation Thanos).
10) Defeat the God Squad - Zeus (regular), Hercules (regular), Amadeus Cho, Demogorge, Thor, Sersi, Hellstrom, Venus (1 day prep)
11) Attack and wipe out the forces of Apokolips, capture or kill Darkseid (10 days prep).
12) Galactus (average level) is about to eat another inhabited planet. They decide to stop him or kill him (5 days prep).
13) Break through the Source Wall and discover the secrets of existence (whatever prep it takes).
Not really a gauntlet, just which goals can they achieve working together?