Castor/Zuse
Castor is the flamboyant owner of the End of Line club located inside the Grid. Although an ally of Flynn's and the ISOs' under his former name 'Zuse', he betrays Sam and Quorra to bargain with CLU; he wishes to control the Grid once CLU leaves for the real world. However, though CLU seems to agree to the bargain, he traps Castor in his club, setting off explosions that kill him and his associate, Gem.
He is played by Michael Sheen.
Read more about this topic: List Of Tron Characters, Tron: Legacy, Betrayal, Uprising and Evolution