When Commander Shepard and his crew were first called in to investigate a powerful virtual intelligence that had gone rogue, I was worried that "Overlord" would suffer from the same tacked-on feeling as did its predecessor, "Kasumi's Stolen Memory." Maybe you didn't hear, but I recently saved the galaxy -- why am I suddenly thrust into the role of interstellar IT guy?
I needn't have worried. While "Overlord" has little bearing on the whole of ME2, it's far more self-contained than "Kasumi," with its own arc and own emotional wallop. It's a fitting conclusion for a game head-and-shoulders-and-most-of-torso above others in its class in terms of storytelling.
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Overlord doesn't jam new characters into your game or add a load of new weapons, but it more than makes up for that with a haunting little story of family, betrayal and sacrifice. Note to other game developers: If you're able to pack that into two hours, you'll always have my seven bucks.