The Strogg have sent a horde of mind-controlled creatures to the Earth in order to annihilate humanity. A lone Space Marine is the only hope.
Fusion Redux adds the original versions of many textures, sprites, models and music to the original Fusion. It also fixes certain bugs like the resizing enemies, and also adds a flashlight to make navigating dark maps easier (this key should be bound in the key menus) Environmental effects like footstep sounds and bullet-hit effects on wood and metal have been added in. Co-op starts have been added to all levels.