Season 2
The first 20 episodes make up the "Nirvana" (ニルヴァーナ, Niruvāna) arc, which adapts Hiro Mashima's Fairy Tail manga from 16th through the middle of the 20th volume. The arc focuses on Fairy Tail's alliance with other guilds to take down the dark guild Oración Seis, aided by the Dragon Slayer Wendy Marvell and a reformed Jellal Fernandez. The next 4 episodes form the self-contained "Daphne" (ダフネ, Dafune) arc, where Gray Fullbuster seemingly betrays the guild and helps Daphne, a deranged wizard, capture Natsu to power an artificial dragon. The last 24 episodes adapt the rest of the manga's 20th volume through the beginning of the 24th volume to form the "Edolas" (エドラス編, Edorasu-hen) arc, wherein the guild becomes trapped in the parallel universe Edolas to be used by the world's ruler Faust to restore magic to his kingdom, and set out to return to their world with the aid of Faust's son Mystogan and Happy's race of winged cats called the Exceed.
All Episodes
S2 E1: The Day of the Fateful Encounter
S2 E2: Special Request. Watch Out for the Guy You Like!
S2 E3: Love & Lucky
S2 E4: Allied Forces, Assemble!
S2 E5: Enter the Oración Seis!
S2 E6: Maiden of the Sky
S2 E7: The Girl and the Ghost
S2 E8: Dead Grand Prix
S2 E9: Darkness
S2 E10: Celestial Skirmish
S2 E11: Jellal of Days Gone By
S2 E12: March of Destruction
S2 E13: Super Aerial Battle: Natsu vs. Cobra!
S2 E14: Wizard Saint Jura
S2 E15: Your Words
S2 E16: Zero
S2 E17: From Pegasus to Fairies
S2 E18: The Power of Feelings
S2 E19: I'm With You
S2 E20: A Guild for One
S2 E21: Call of the Dragon
S2 E22: Natsu vs Gray!!
S2 E23: Friendship Overcomes the Dead
S2 E24: A Fairy Tail Wizard
S2 E25: Rainbow Cherry Blossoms
S2 E26: Wendy's First Big Job!?
S2 E27: 24-Hour Endurance Road Race
S2 E28: Gildarts
S2 E29: Earth Land
S2 E30: Edolas
S2 E31: Fairy Hunter
S2 E32: Key of Hope
S2 E33: Fireball
S2 E34: Welcome Home
S2 E35: Extalia
S2 E36: Fly, to Our Friends!
S2 E37: Code ETD
S2 E38: Erza vs. Erza
S2 E39: We're Talking About Lives Here!!!!
S2 E40: For Pride's Sake, the River of Stars
S2 E41: The Apocalyptic Dragon Chain Cannon
S2 E42: The Boy Back Then
S2 E43: Dragon Sense
S2 E44: O Living Ones
S2 E45: I’m Standing Right Here
S2 E46: Bye-Bye, Edolas
S2 E47: Lisanna
S2 E48: He Who Extinguishes Life