Xiaolin Showdown is an animated series that aired on Kids' WB! . Set in a world where martial arts battles and Eastern magic are commonplace, the series follows four young warriors in training that battle the forces of evil. They do this by protecting Shen Gong Wu (artifacts with magical abilities) from villains that would use them to conquer the world. It ran for 3 seasons between 2003 to 2006, airing a total of 52 episodes.
A follow up series called Xiaolin Chronicles was released in 2013 though this aired on Disney XD and later Netflix as the Kids WB! block was shut down by that point.