Radium

Radium is one of the five champions in Lego Stunt Rally, the others being Baron Flambo, Snake, Glacia, and Mr. X.

Radium was once a Rock Raider but was expelled from the program for performing radioactive tests on people. He wears a yellow radioactive suit to protect others from his glowing radiation. He drives a yellow variation of the Rad Truck, and he is the City Champion.