Naruto Shippūden 300: "The Mizukage, the Giant Clam, and the Mirage"
This was pretty entertaining! At least Naruto's Planetary Rasengan was shown in a cool way. While some of the jokes around Mizukage were repeated a little too much (and all the fodder ninajs looked even more pathetic than usual), it was a fun episode. The Second Mizukage ranks up there with Oonoki for "scene-stealing new characters" in the war.
Hell, even the Ninja Alliance knew that those jackholes were fodder--They only gave them two kunai or one giant shuriken apiece. They had to reuse the same damn ones whenever they needed to refail an attack.
No wonder no one gave a shit that half of them had been killed in the first day...