Unknown is the final boss in the Tokyo Xtreme Racer Series.Unknown is the final boss in every game of the series to date (with the exception of Tokyo Xtreme Racer 3.)
How to get him to appearEdit
Simply defeat every rival on the list. Unknown will immediately challenge you after victory.
In Tokyo Xtreme Racer Zero, he drives a dark blue 240Z, an obvious refrence to the "Devil Z" the lead car in the popular "Wangan Midnight" series. His driving skills and car power are very high compared to the other bosses. It is hinted that the driver may be Akio Asakura, the driver of "Devil Z" from his respective series.
In Tokyo Xtreme Racer 3, Unknown returns and requests the battle after the player have defeated 599 rivals. His appearence is a mirrored, transparent version of your current vehicle. He can go through traffic cars, as well your car (by the way, blocking won't work).
You can see the battle here. The car below is a Pontiac Firebird with a swapped engine (Unknow won't have the engine swapped and will use the original car's engine)
In Tokyo Xtreme Racer Drift 2, one of the rivals resemble Unknown, although Unknown himself did not appear in the game. The last boss goes to Emotional King.