The Hostile Program is a cybernetic corrupted creature, commanded by the MCP, and Sark, to deal with intruders within the datascape. Featured as a minor boss enemy in Kingdom Hearts II, the Hostile Program is also featured in the villains tournament.
During his fight with Master Xehanort, Sark summons the Hostile Program to deal with the keyblade master. Unfortunately, the Program easily falls to Xehanort's powers. However, this plan was according to Sark's plan, as the commander uses a Heartless minion to finish off Xehanort, while he is distracted.