Contra III The Alien Wars
Earth is in trouble! An alien space craft of vast proportions has somehow managed to completely deactivate the Earth Defence Net and launch a massive attack on the major population centres of the world. Unable to retaliate, the leaders of each nation watch as the aliens build their own command centres and begin to take over the world!
Meeting at an underground location, the leaders decide that only a small, one or two-man task force could successfully breach the aliens' defences and in a blaze of photon annihilation, send them back from whence they came.