My favourite LEGO Ninjago: Masters of Spinjitzu T.V. series villains are Pythor, because he is an anthropomorphic reptile and is a villain with great intelligence, wit and personality, and The Overlord, because he is such an all-powerful, bad-■■■ villain who seems to come back again and again as a foil to the Ninja!
You can always buy the DVD's, and Seasons One and Two have recently been released as one DVD box set; or you can watch them for free of charge on www.animeflavor.com and/or www.watchcartoononline.com!
Yes... Pythor is essentially the Crooler of the LEGO Ninjago: Masters of Spinjitzu T.V. series, as both him and Crooler gave their respective Tribes a bad reputation!!!