Dead Cell are a terrorist group that only feature in one Metal Gear game, Metal Gear Solid 2: Sons of Liberty. They are supposed to be similar to the rogue FOXHOUND unit that Solid Snake fought in Metal Gear Solid. This was because all of the game was part of a plot formed by The Patriots to make Raiden the perfect soldier.
Dead Cell was originally a group that would launch surprise attacks on friendly units, in an attempt to toughen them up and get them ready for real combat. However, six months before the events of Metal Gear Solid 2, the unit turned rogue and only three members survived. These were Fortune, Vamp and Fatman.
Related Threadssolidus must be dead cell!!!!! - last post by @ Apr 25, 2002
Dead Cell VS Foxhound VS Cobra VS B&B? Rank! *Spoilers - last post by @ Dec 24, 2010
Cobra unit or Dead Cell - last post by @ Feb 2, 2005
Fox Hound vs. Dead Cell - last post by @ May 11, 2005
Different versions of Yell "Dead Cell" song - last post by @ Jun 20, 2011