Fairy Tail Episode 146: Time Spiral
Episode 146 of 175 of Fairy Tail, aired August 31, 2012, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Cardinal Rapowant's devious plans begin coming to fruition as time itself warps, affecting even the Fairy Tail members aboard Ichiya's Christina. En route to rescue Natsu and Lucy, they become children, elderly, and even different species!