From wokepedia:

"Q (voiced by Len Carlson) - A mysterious figure wearing a mask and an overcoat who is being pursued by the CIA because of sightings around the world near accidents and he is even thought to have been the cause. While he can be chosen as a playable character, he is a hidden computer-controlled opponent in the single-player mode."

I find it interesting that the clowns are chasing this mysterious character. Also, this game came out in 1999!