Sark

Sark (full program name SARK-ES-1117821) is the secondary antagonist in TRON. He was written by Ed Dillinger, and became the commander of the MCP's army and overseer of the games fought on the Game Grid. He was a merciless and evil program, willing to do anything that pleased the MCP. Sark was in charge of forcing the programs that believed in the users to play video game type gladiator games with personnel from Sark's Army as the opponents. He looked forward to playing the gladiator games when he had the chance. So ruthless was Sark that he was described as "Brutal and Needlessly Sadistic" by the MCP himself.

When Kevin Flynn was brought into the Game Grid for "pushing" the MCP in the real world, Sark expressed some apprehension to squaring off against a user. The MCP tortured Sark until he saw his leader's point of view and instructed him that Flynn was to be in the games until he dies playing.

During the a light cycle match, when Flynn, Tron, and Ram all escaped the game grid, Sark relentlessly pursued the renegades, his Light Tanks derezzing Ram. Sark was instructed to round up the remaining renegade programs and bring them to the MCP. With all his enemies in one place, the MCP felt a presence on the Mesa outside its core, Tron. Sark went forward to deal with the program saying that Tron should have joined his ranks because they would have "made a great team."

After a fierce disc battle, Sark suffered a mortal blow from Tron that was so powerful the Commander's own disk was split in two trying to block the shot. Tron's disc cut right through Sark's head and scalped him.

Sark was saved and resurrected by the MCP, who granted him all of his functions to stop Tron. As Sark and Tron battled, Flynn jumped into the MCP's communication beam distracting the MCP long enough for Tron to get his disc in. Sark was derezzed when his master perished.