STAND OFF

After decades of fighting, we've come to a standoff.

Yet- we've destroyed the whole enemy army. Why haven't we come to a resolution?

    Their weapon, the BFEG, is still locked onto earth and prepared to destroy it. We knew the trigger was embedded in the leader- when we downed their robot, the BFEG should have disengaged. It was in the schematics.

Then, a flash of understanding: what if the trigger woke up something else?

    One of your team is a sleeper agent of the enemy, and has been acting as an information source unknowingly. The trigger for the BFEG is, assumedly, implanted in one of you.

Goal of Play
    To figure out and destroy the agent's mech before the BFEG explodes earth, and achieve world peace.