Planet Cannon

Planetary Defense. Invading fleets must fight and destroy the Cannon before they can capture the planet. You can upgrade the Planet Cannon in several ways and add a Planet Shield to make it harder to defeat.

Double Rate

Causes the planet standard cannon fires twice as often.


Adds a Shockwave Bomb launcher.


Adds a Nuclear Missile launcher.


Creates an orbital fleet around the planet.


Buildings and facilities are destroyed if the planet is taken over.