Season 1

1.06 Lost Girls
1.13 Children of the Damned
1.20 Blood Brothers
1.22 Founder’s Day

Season 2

2.01 The Return
2.03 Bad Moon Rising
2.04 Memory Lane
2.05 Kill Or Be Killed
2.06 Plan B
2.07 Masquerade
2.09 Katerina
2.10 The Sacrifice
2.11 By the Light of the Moon
2.13 Daddy Issues
2.15 The Dinner Party
2.16 The House Guest
2.17 Know Thy Enemy
2.18 The Last Dance
2.19 Klaus
2.20 The Last Day
2.21 The Sun Also Rises 
2.22 As I Lay Dying

Season 3

3.03 The End Of The Affair
3.04 Disturbing Behavior 
3.05 The Reckoning
3.06 Smells Like Teen Spirit
3.09 Homecoming