Zeus

He is known by the CIA and NSA as the best hacker on the planet. He is also the man responsible for putting Marco Owen in prison. Marco has a fierce hatred of Zeus as a result of this, and it is only after the CIA shows Marco Zeus's picture and tells him of his involvement in the Medusa project that he agrees to go to the castle facility and infiltrate Level 4. Zeus continually taunts Marco with the statement "you will never reach my level". However, it has been noted by the CIA and the NSA that despite being betrayed by Zeus, Marco is apparently on par with him. (Source: Wikipedia)