Elena hasappeared in every episode up to date

Season 1

• Pilot
• The Night of the Comet
• Friday Night Bites
• Family Ties
• You're Undead to Me
• Lost Girls
• Haunted
• 162 Candles
• History Repeating
• The Turning Point
• Bloodlines
• Unpleasantville
• Children of the Damned
• Fool Me Once
• A Few Good Men
• There Goes the Neighborhood
• Let the Right One In
• Under Control
• Miss Mystic Falls
• Blood Brothers
• Isobel
• Founder's Day

Season 2

• The Return
• Brave New World
• Bad Moon Rising
• Memory Lane
• Kill or Be Killed
• Plan B
• Masquerade
• Rose
• Katerina
• The Sacrifice
• By the Light of the Moon
• The Descent
• Daddy Issues
• Crying Wolf
• The Dinner Party
• The House Guest
• Know Thy Enemy
• The Last Dance
• Klaus
• The Last Day
• The Sun Also Rises
• As I Lay Dying

Season 3

• The Birthday
• The Hybrid
• The End of The Affair
• Disturbing Behavior
• The Reckoning
• Smells Like Teen Spirit
• Ghost World