Sark

Sark is a villain in Kingdom Hearts II. He is the MCP's second-in-command. His first appearance is a villain in Disney's Tron (1982). Originally portrayed by David Warner, as was the MCP, he and his master are voiced by Corey Burton, who does a convincing rendition of Warner's distinct British voice.

Kingdom Hearts II
Tron (1982)

''A powerful program who doesn't serve any user -- just the MCP. Commander Sark is pretty harsh to any program that tries to resist his master's power.''

Description
Sark is a red battle program, designed to look like his creator Ed Dillinger, who also created the MCP. His voice is the same as his as well. Sark is the head of the game grid of the MCP. He trains programs to fight, and pits them up against other programs. He will do (or is forced to do) anything the MCP commands him to do. His primary weapon is an Identity Disk, similar to that of Tron's.

Story
Sark and the MCP are the main antagonists of Space Paranoids. Sark has been made a Heartless commander by the MCP, empowering him even more. Not much of Sark is heard of after his first appearance, where he electrocutes 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 de-resoluted, but the MCP wants to keep Tron because the latter has access to the password of the DTD database.

His second appearance is at the boss battle against the MCP. Strangely enough, here, despite having met before, Sora cannot remember Sark's name until Tron refreshes him. The normal Sark is fought, along with his Identity Disk. Weakened, he tells Tron that they could have made a great team, but Tron flings his Identity Disk at him and kills him. Not long after, the MCP revives him and grants all his functions to him, causing him to enlarge. He is a second-hand enemy as his giant-self while you fight the MCP. Like the movie, Sark is defeated along with the MCP.

Trivia

 * Corey Burton first voiced Sark while doing an ADR loop in place of David Warner. He would also reprise the voiceover in the Tron video games. Burton loved the sound of Warner's voice so much that he would carry the voice over into Transformers G1 and Transformers Animated as Decepticon Shockwave; a ruthless servant only loyal to his powerful master Megatron, much like the relationship between Sark and the MCP.