Fight takes place in Metropolis, when Superman is away or some sh1t.
Both sides have 8 days, 21 hours, 14 minutes, and 3 seconds to prepare. Batman, Cap, and Iron Man have access to their money and every upgrade/thing they keep around their places.
Shepard's squad, consisting of a vanguard Shepard, Tali, Ashley, Garrus, Liara, and EDI, gets the same time to prepare and access to unlocks/money from the Normandy.
Who wins?
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Shepherd.