The Foe are the enemy alien race in Defender of the Future. They are the replacement for the Vortex race of the Genesis games. They are an aggresive race that wishes to colonize and obliterate all planets that come in their path. Unlike the Vortex, they have a fleet of ships instead of just one mothership. In the intro it is stated that they "devour" civilizations but it is not known if this means they use them as food sources like the Vortex did. They even utilize kamikaze tactics as is shown with the ships that try to break through The Guardian's forcefield and are instantly destroyed. Eventually they destroy the upper half of the Guardian and begin to attack the ocean.