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Can Sentry's nemesis take on the JLA?

JLA:

Superman(Pre-Crisis)
Wonder Woman
Dr. Fayt
The Flash
Martian Manhunter
Batman
Green arrow
Captain Atom
Aquaman
Firestorm
Faith
Plastic Man
Booster Gold
Green Lantern(Kyle)
Green Lantern(John)
Sentinel(On loan from JSA)

The JLA have a week to prepare for the coming of the Void...

A week or not, the JLA are screwed. All of Marvel's earth heroes could nothing against him/it.