March of Destruction - S2.E12

Brain manages to gain control of Nirvana and actives its second stage - a monster that begins marching towards Cait Shelter, causing Natsu, Gray, Lucy, and Happy to rush off and defeat it. When Natsu and Happy try to get ahead, they are forced into an aerial battle against Cobra. Meanwhile, Erza saves Jellal and convinces him to live for the future, and they begin to devise a plan to destroy Nirvana.