The Invid Invasion

Plot:

The Earth is invaded by a race of aliens calling themselves the Invid. They have come to the Earth to cultivate its vast supplies of Protoculture, a multipurpose energy source and foodstuff, which is of prime importance to their race. Without Protoculture, the Invid Colony could wither and die. With enough, their race could grow and become the most powerful in the universe. Their invasion and conquest of the Earth is swift and complete. A huge interstellar fleet is sent to Earth by Admiral Rick Hunter to appraise the situation and test the strengths of this new alien ...