Extremely filler, but it did have cool little challenge in each chapter to spice things up, like only being able to fight with certain weapons, reduced visibility or changes in enemy behaviour. In this, you follow Baird and Cole with a different group of people in a prequel to the original Gears of War. There's also an extra campaign that coincides with Gears of War 3 where Baird and Cole reunite with that team to get supplies.