Unknown

Unknown is the first boss on Adventure Mode.Unknown's Kart is black and has a question mark symbol on the front of his/hers kart.

Epic Racers
Unknown is the first boss on Adventure Mode.Once you defeated Egypt Showdown on Adventure Mode.A "mysterious" driver named "Unknown" in a black suit challenged you to a race in Egypt Showdown for no apparent reason.

When you defeat Unknown, the mysterious driver turned out to be two snotty bratty kids named Princess and Albert.Princess and Albert were both on top of each other in the black suit.Albert was the one padeling the kart, and Princess was the main one driving the vehicle.They both argued at you for cheating but they were both taken up by security and thrown into a police car.