They Came From Planet X! is a Games & Entertainment::Action software developed by Big Fish Games. After our trial and test, the software was found to be official, secure and free. Here is the official description for They Came From Planet X!: Galaxy Defense needs your help. Hostile Planet X Alliance marauders have been spotted in the beta sector near base #4432. They came from Planet X and they want to destroy the galaxy! Pilot through the invaders and defend the base from attack. Use the arrow keys to move your ship and the space bar to fire. Purchase upgrades to enhance your fighting power. Now is the time for all good fighters to come to the aid of their galaxy. Do you accept the mission? you can download They Came From Planet X! free now.