This walkthrough guide will cover the complete Overload DLC mission pack for the Mass Effect 2 action role-playing game on the Xbox 360. Overload became available for download in June 2010 on Xbox Live Arcade (XBLA), and features four different missions. Watch this series for all the gameplay action from Mahalo.
Mission 1: Hermes Station [1-2]
Aite Planet Surface 
Mission 2: Prometheus Station [4-6]
Mission 3: Vulcan Station [7-8]
Mission 4: Atlas Station [9-11]
Below is the plot description of Overload from BioWare.
When sent to investigate a Cerberus research base that's mysteriously gone silent, Shepard arrives to find Geth overrunning the base. The sole survivor, Chief Scientist Archer, paints a dire picture: an experiment to fuse a human volunteer with a virtual intelligence created a dangerous hybrid "VI overlord". The rampaging VI has already attacked three other Cerberus bases, controlling any technology it finds in an attempt to break free–and unleashing Geth across the planet. Unless Shepard can infiltrate the VI's fortress and shut it down, this homicidal intelligence will beam itself-off planet and wreak havoc on other systems. The action unfolds over five new level areas, with two new achievements.
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