The Guardian of the Cloud's Charge (雲の守護者の暴走) is the 54th episode of the Katekyō Hitman Reborn! anime series.
After the Cloud Ring conflict, Xanxus tries to retrieve Gola Mosca. After Hibari halts his attempt at retrieval, Mosca goes on a rampage, shooting wildly at everyone, friend and foe. Back at Vongola Headquarters, it is revealed that the 9th living there is, in fact, a fake. Tsuna comes to the rescue of his friends and holds off Mosca, at which time Mosca attacks Tsuna only.