Fairy Tail Episode 70: Natsu vs. Gray!!
Episode 70 of 175 of Fairy Tail, aired March 13, 2011, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Gray and Natsu are fighting with all their power while everyone at Fairy Tail begin to worry. When Erza and Lucy decided to go and find their freinds, they encounter beasts that mimic their abilities. When Natsu is finally caught, Daphne reveals a handmade dragon designed to drain Natsu's power.