Team Metal Gear vs Team S.T.A.R.S.
Wesker and his three former subordinates (Chris, Jill and Barry) make a temporary truce in order to take on a rejuvenated Solid Snake, Ocelot, Vamp and Meryl.
The battle takes place in the ruins of downtown Empire City. Each person starts with their default weapons. Other weapons are OSP.
And yes, Team S.T.A.R.S. is in their classic attire (save for Jill, who is missing her beret...and still blonde).