Quasar
Genis
The Sentry
Scarlet Witch (with reality warping powers)
Sersi
Classic Thor (with full Asgardian battle armor)
Black Bolt
Iron Man
Dr. Strange
Crystal
Hercules (immortal)
Black Panther
Captain America
Be enough for--
Onslaught (with the full capabilities of Franklin Richards and X-Man, and the Cyttorak Gem)?
The battle takes place on the dark side of the moon.
Quasar - makes a giant cheese grater....'nuff said
Genis - put him in the Microverse
The Sentry - we dont really know much about Sentry yet
Scarlet Witch (with reality warping powers) - wishes him out of existence
Classic Thor (with full Asgardian battle armor) - wut Armor?
Black Bolt - screams....Onslaught is reduced to rubble.
Dr. Strange - well, with help, he could wrap Onslaught in the Crimson Bands of Cyttorak and let the others beat on him.
Hercules (immortal) - in a physical fight, i think he'd win, since when Onslaught fought Mindless Hulk it ended in a double-KO, i think Herc can, at the very least, do the same, as in my opinion Immortal Hercules is the strongest Hero in Marvel..
TOGETHER, THE TEAM WINS EVERY TIME. ONSLAUGHT HAS NO CHANCE WHATSOEVER.