Sure... Some notes about Xiaolin Showdown.
Season 1.
a. The monks powers are just their basic elementary abilities, although Omi is the only one to master a specialty elementary move known as the Tsunami Strike.
b. The villain cast revolved primarily around Wuia and Jack Spicer with his variety of bots.
Katnappe (pronounced cat-na-pay) and Tubbi-Mura were among the chief recurring villains.
c. The Season 1 storyline ends with the battle against the first form of Mala-Mala Jung, but the season ends when Reymundo turns his back on the rest of the team upset that he didn't advance to the next level uses the Serpent's Tail with the Reversing Mirror to bring Wuia back to full power.
Season 2.
a. The monks, known as dragons-in-training advance to become Xiaolin Apprentices.
b. The Season starts with Omi going back in time to find Grand Master Dashi to get a new puzzle box to imprison Wuia again.
c. The apprentices all get specialty elementary moves.
Kimiko: Yudelay Flip.
Clay: Seismic Kick.
Raymundo (the last one to get his move): Typhoon Boom.
Omi: Tsunami Strike.
*During Season 2, some episodes changed his Tsunami Strike for Tornado Strike, trying to show some level of sensitivity, since the tsunami that hit and submerged much of Sri Lanka occured that year.
Also, the apprentices combined to pull off a group attack known as the Dragon Excumai Formation and could enhance a woo's effects by calling out their particular elementary power after it's name. This explains why Omi could change the Orb of Tornami (his main woo)'s effect from steam to water to ice.
d. Chase Yang becomes the new top evil dog, attempting to bring Omi over to the dark side.
Vlad (a Russian strong guy), Panda-Bubba and other creatures such as the Cyclops and Mermaid/Siren appear as recurring villains.
e. The season ends when Chase Yang traps Master Fung's chi in the Yin-Yang World using the Yin and Yang Yo-Yos, successfully recruiting Omi to his side of the Hailin forces.
Season 3.
a. The monks advanced to the next level, Woodai Warriors. At this level they had:
Specialty Moves:
Raymundo: Woodai Star Wind.
Clay: Woodai Crater Earth.
Kimiko: Woodai Mars Fire.
Omi: Woodai Neptune Water.
Woodai Weapons:
Raymundo: Blade of the Nebula.
Clay: Big Bang Meteorang.
Kimiko: Arrows Sparrow.
Omi: Shemo Staff.
Elemental Woo:
Raymundo: Crest of the Condor.
Clay: Longhorn Taurus.
Kimiko: Cat's Eye Draco.
Omi: Kigon Charm.
Group Attack: Woodai Orion Formation.
They had to open their minds to control their weapons and elemental woo, who became a sort of second spirit being of their particular owners.
b. The season started with the gang going in to retrieve Master Fung's chi from the Yin-Yang World. Thing is that if you left with only one of the two yo-yos, your chi was switched from good to evil and viceversa; but if you left with both yo-yos, then your chi would be intact.
c. The new main villain this year was Hannibal Roy Bean, a small bean-shaped character. It was Bean who came between Chase Yang and his friends, converting him to the Hailin side in the first place.
c. The season, and series for that matter, ended with Omi going on a quest of his own into the future to convert Chase back to the side of good... But that didn't go so well, and it seems the others were off on their own quests, resulting in the end where Raymundo was chosen grand leader of the monks.
There haven't been any new episodes after that, just giving you some info to keep up with all the episodes as they air on Cartoon Network who's got pretty much most of the three seasons in their various rotations.