Ground Zero

A Quake II add-on with a few new weapons, monsters, and levels. The Earth fleet attacking Stroggos is stranded in orbit due to a Strogg gravity well. The player has landed on the planet with one mission: destroy the gravity well. New weapons include the chainsaw, the ETF (explosive-tipped flechette) rifle, the proximity mine launcher and the plasma beam. New power-ups include tesla mines, the defender sphere, the vengeance sphere, the hunter sphere, and the doppelganger. (mobygames)