Xiaolin Showdown, and its sequel series, Xiaolin Chronicles are cartoons that ran from 2003-2006 and 2013-2015 respectively. The show typically followed the various adventures of the four Xiaolin Monks and their companions and enemies.
Power of the verse
Very Powerful. The series has several planetary threats, into the point it became a running gag. In this verse exists the Sapphire Dragon, who can turn any being into a sapphire statue, The Heylin Seed, which nearly destroyed the world in the past, objects that can manipulate the Moon at whim, etc. The villains of the verse are very impressive themselves, Wuya's mere presence was capable of warping the planet in her image, Chase Young was able to warp the world into perpetual chaos, Jack Spicer is considered a universal threat and so on. While initially completely outmatched, the heroes of the verse do eventually become strong enough to fend off the villains.
Xiaolin Chronicles expanded the power greatly, introducing a Multiverse, and with it comes Multiversal threats such as the Heylin Dragon. Currently, the most powerful being is Tai Shui, the Cosmic Dragon who is the Multiverse in its entirety.
The series also has some very powerful hax. The various Shen Gong Wu can have powerful abilities such as Dream Manipulation, Fear Inducement, Interdimensional BFR, Nigh-Omniscience, Planetary Teleportation, Time Travel and the list goes on.
Master Monk Guan
Evil Monk Guan
Hannibal Roy Bean