Sark

Sark is a command program introduced in Kingdom Hearts, and originally taken from the Disney film ''. He is a loyal enforcer to the Master Control Program, and sees no need for users. This puts him in conflict with Tron's goals of keeping the system running in service of users.

Kingdom Hearts II
Sark has been made a Heartless commander by the MCP, empowering him even more.

Sark derezzes Donald and Goofy in front of Sora, and imprisons the three in the Pit Cell. Not long after their imprisonment, Sark is called up by the MCP and suggests that Tron be derezzed, but the MCP wants to keep Tron because the latter has access to the password of the D.T.D database.

After Sora, Donald and Goofy returned to Space Paranoids, they arrived in Sark's Game Grid where they are chosen to play a few light-cycling games. They manage to escape and meet up with Tron.

Sark, with his Identity Disk, is fought by Sora and company during their final battle against the MCP. Weakened, he tells Tron that they could have made a great team, but Tron flings his Identity Disk at him and knocks him unconscious and derezzes him.

The MCP revives him and grants all his functions to him, causing him to enlarge. Sora and Tron battle Sark and the MCP, and defeat both by deletion.

Appearance
Sark, like Tron, resembles a grey-skinned human male under his grey armor. Like Tron's, his armor is covered with circuity, but his circuitry is red with an orange glow. The circuitry on Sark is also much more complex than Tron's and sports a "V"-shaped symbol in several places. Sark's helmet is attached to his armor and covers every part of his head except his face. His Identity Disk is attached to his upper back.

Personality
Sark is arrogant and ruthless, seeking to derezz Tron for disobeying the MCP. He is loyal to the MCP and his vision of Space Paranoids, in which the system is independent of users.

Origin
Sark originated from the 1982 movie Tron, portrayed by British actor. He was the Commander of the MCP's army and overseer of the Game Grid. When Tron, his user Flynn, and another program, Ram, escaped the Game Grid, Sark was ordered to round them up. After a battle between Tron and himself, Tron's Identity Disk cut through Sark's head. The MCP restored him, giving him all his functions to stop Tron. When Flynn defeated the MCP, Sark was derezzed along with him.

As David Warner was unavailable to reprise his role as Sark and the MCP due to a previous commitment, both were voiced by Corey Burton.