Season 2
This season, Katherine's appearance in Mystic Falls will throw a wrench into the love triangle between Stefan, Elena and Damon, and the other residents of Mystic Falls must choose sides as they fall victim to a new breed of danger. New and unexpected friendships will be forged, allies will become enemies and hearts will be broken. Plus, Stefan and Damon will be forced to face a villain more evil and diabolical than they thought possible.
Episodes
1 The Return Sep 9, 2010 
2 Brave New World Sep 16, 2010 
3 Bad Moon Rising Sep 23, 2010 
4 Memory Lane Sep 30, 2010 
5 Kill or Be Killed Oct 7, 2010 
6 Plan B Oct 21, 2010 
7 Masquerade Oct 28, 2010 
8 Rose Nov 4, 2010 
9 Katerina Nov 11, 2010 
10 The Sacrifice Dec 2, 2010 
11 By the Light of the Moon Dec 9, 2010 
12 The Descent Jan 27, 2011 
13 Daddy Issues Feb 3, 2011 
14 Crying Wolf Feb 10, 2011 
15 The Dinner Party Feb 17, 2011 
16 The House Guest Feb 24, 2011 
17 Know Thy Enemy Apr 7, 2011 
18 The Last Dance Apr 14, 2011 
19 Klaus Apr 21, 2011 
20 The Last Day Apr 28, 2011 
21 The Sun Also Rises May 5, 2011 
22 As I Lay Dying May 12, 2011