The people over at SpeedGamers.com are holding a 72 Hour Metroid Marathon.

The 72 Hour Metroid Marathon starts on Augusts 15th @6pm cst. We will be raising money for St. Jude Children’s Research Hospital. The marathon will be streamed live via webcam on our website. The webcam feed will give you both a view of the games we will be playing and also a view of the action going on in the room. We will give out prizes following each game to viewers regardless of where they live.

The Game list is : (Not in any specific order)
Metroid, Metroid Zero mission, Metroid II: Return of Samus, Super Metroid, Metroid Prime1, Metroid Prime Hunters, Metroid Prime 2, Metroid Prime 3, Metroid Fusion

For more info go to SpeedGamers.com