The Vampire Diaries Know Thy Enemy (Season 2, Episode 17)
TV-14
TV Episode | 42 min | Drama, Fantasy, Horror

The Vampire Diaries

Know Thy Enemy (Season 2, Episode 17)

TV-14

TV Episode | 42 min | Drama, Fantasy, Horror

Isobel unexpectedly returns, leaving Jenna devastated. Bonnie attempts to harness her ancestors' power. Stefan and Damon realise that they have a new weapon.

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Cast	+ Add Cast
18 cast members

Name	Known for
Nina Dobrev Elena Gilbert / Katherine Pierce Elena Gilbert / Katherine Pierce See fewer	The Perks of Being a Wallflower (2012)
Paul Wesley Stefan Salvatore Stefan Salvatore See fewer	Star Trek: Strange New Worlds (2022)
Ian Somerhalder Damon Salvatore Damon Salvatore See fewer	The Vampire Diaries (2009)
Steven R. McQueen Jeremy Gilbert Jeremy Gilbert See fewer	Piranha 3D (2010)
Sara Canning Jenna Sommers Jenna Sommers See fewer	A Series of Unfortunate Events (2017)
Kat Graham Bonnie Bennett Bonnie Bennett See fewer	How It Ends (2018)
Candice King Caroline Forbes (as Candice Accola) Caroline Forbes (as Candice Accola) See fewer	Juno (2007)
Zach Roerig Matt Donovan Matt Donovan See fewer	The Vampire Diaries (2009)
Michael Trevino Tyler Lockwood (credit only) Tyler Lockwood (credit only) See fewer	The Vampire Diaries (2009)
Matthew Davis Alaric Saltzman (as Matt Davis) Alaric Saltzman (as Matt Davis) See fewer	Legally Blonde (2001)
Mia Kirshner Isobel Flemming Isobel Flemming See fewer	Not Another Teen Movie (2001)
David Anders John Gilbert John Gilbert See fewer	The Revenant (I) (2009)
Marguerite MacIntyre Sheriff Liz Forbes Sheriff Liz Forbes See fewer	Red Dragon (2002)
Bryton James Luka Martin Luka Martin See fewer	The Young and the Restless (1973)
Gino Anthony Pesi Maddox Maddox See fewer	Shades of Blue (2016)
Susan Walters Carol Lockwood Carol Lockwood See fewer	The Young and the Restless (1973)
Michael Roark Cowboy Cowboy See fewer	Bennett's War (2019)
Tony D Sims Student (uncredited) Student (uncredited) See fewer	Clairvoyance the Ellis Files (2015)