Sark

"Tenacious little bugs! Your time is up! It's time for de-resolution!"

- Sark to Tron, Sora, Donald, and Goofy in Kingdom Hearts 2

Commander Sark (simply known as Sark) is the secondary antagonist of the 1982 movie Tron and was the right-hand man of the MCP - a living embodiment of the MCP's will and a ruthless tyrant who would do all in his power to prevent the hero of the story from attaining freedom.

Appearance
Sark is distinguished by his cybernetic armor - which is colored red as opposed to blue - he also has great power over the virtual world and is also a very shrewd individual capable of plotting against his enemy.

Sark also appears as a boss in Kingdom Hearts - alongside MCP - where he gains the ability to grow considerably in size and power via linking with the MCP.

Role
When the MCP brought Kevin Flynn into the digital world, Sark was assigned to put Flynn in the games in hopes that he would be derezzed. At first, Sark has some objection in facing off a user, but the MCP tortured Sark into accepting his plan. However, Flynn escapes with Tron and Ram, prompting an annoyed Sark to send in reinforcements after them, though Ram ends up being derezzed by one of the MCP's tanks. Sark was then assigned to capture all renegade programs and bring them to the MCP before engaging into a disc fight against Tron.

Though Tron manages to best out on Sark during the fight by cutting out Sark's head with disc, things took a turn for the worst when the MCP revived Sark by giving him all his functions, allowing Sark to grow in size and strength. As Sark engaged into another battle with Tron, they both witnessed Flynn jumping into the MCP's communication beam, which allowed Tron to throw his disc into the MCP's core. As a result, the MCP perished and Sark derezzed along with him.