Fairy Tail Episode 18: Reach the Sky Above
Episode 18 of 175 of Fairy Tail, aired February 14, 2010, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Erza recruits Natsu to help her "destroy the moon" as Lucy and Gray look on with disbelief with the rest of the villagers. Afterward Erza reminds Lucy, Natsu, Gray, and Happy of their impending punishment!