The secondary antagonist in TRON is Sark (full program name SARK-ES-1117821). Ed Dillinger wrote him, and he became the MCP's army commander and overseer of the games fought on the Game Grid. He was a ruthless and cruel program, eager to do whatever the MCP wanted. Sark was in charge of forcing programs that believed in their users to play video game-style gladiator games against Sark's Army members. When he had the chance, he was excited to play the gladiator games. Sark was so vicious that the MCP himself described him as "brutal and needlessly nasty."