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.
Episodes
1 The Day of the Fateful Encounter Oct 11, 2010 
2 Special Request. Watch Out for the Guy You Like! Oct 18, 2010 
3 Love & Lucky Oct 25, 2010 
4 Allied Forces, Assemble! Nov 1, 2010 
5 Enter the Oración Seis! Nov 8, 2010 
6 Maiden of the Sky Nov 15, 2010 
7 The Girl and the Ghost Nov 22, 2010 
8 Dead Grand Prix Nov 29, 2010 
9 Darkness Dec 6, 2010 
10 Celestial Skirmish Dec 13, 2010 
11 Jellal of Days Gone By Dec 20, 2010 
12 March of Destruction Dec 27, 2010 
13 Super Aerial Battle: Natsu vs. Cobra! Jan 10, 2011 
14 Wizard Saint Jura Jan 17, 2011 
15 Your Words Jan 24, 2011 
16 Zero Jan 31, 2011 
17 From Pegasus to Fairies Feb 7, 2011 
18 The Power of Feelings Feb 14, 2011 
19 I'm With You Feb 21, 2011 
20 A Guild for One Feb 28, 2011 
21 Call of the Dragon Mar 7, 2011 
22 Natsu vs Gray!! Mar 14, 2011 
23 Friendship Overcomes the Dead Mar 21, 2011 
24 A Fairy Tail Wizard Mar 28, 2011 
25 Rainbow Cherry Blossoms Apr 2, 2011 
26 Wendy's First Big Job!? Apr 9, 2011 
27 24-Hour Endurance Road Race Apr 16, 2011 
28 Gildarts Apr 23, 2011 
29 Earth Land Apr 30, 2011 
30 Edolas May 7, 2011 
31 Fairy Hunter May 14, 2011 
32 Key of Hope May 21, 2011 
33 Fireball May 28, 2011 
34 Welcome Home Jun 4, 2011 
35 Extalia Jun 11, 2011 
36 Fly, to Our Friends! Jun 18, 2011 
37 Code ETD Jun 25, 2011 
38 Erza vs. Erza Jul 2, 2011 
39 We're Talking About Lives Here!!!! Jul 9, 2011 
40 For Pride's Sake, the River of Stars Jul 16, 2011 
41 The Apocalyptic Dragon Chain Cannon Jul 23, 2011 
42 The Boy Back Then Jul 30, 2011 
43 Dragon Sense Aug 6, 2011 
44 O Living Ones Aug 13, 2011 
45 I’m Standing Right Here Aug 20, 2011 
46 Bye-Bye, Edolas Aug 27, 2011 
47 Lisanna Sep 3, 2011 
48 He Who Extinguishes Life Sep 10, 2011