Damon has found an adversary that isn't scared of him: Mason "I'm a werewolf" Lockwood.
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Stefan is out to learn more about Katherine. This is a photo from the episode "Memory Lane."
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On the episode "Memory Lane," Katherine is on the prowl. This can't be good, can it?
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Damon was hoping he was through with Katherine. But we all know that won't be the case for awhile, don't we?
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Just keep walking, Damon. Nothing good can come out of you flirting or talking to Katherine.
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Hi there, Katherine... Petrova! This vixen has her hands on the book that discusses her history.
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Damon is on to you, Mason! These two share a moment on the fourth episode of the second season.
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Katherine makes her presence felt again on the episode "Memory Lane." She's seen here with Damon.
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The Vampire Diaries Season 2 Episode 4 Quotes

Stefan: Why are you back in town?
Katherine: Three reasons: you, you, and you.

I could rip you to shreds and do my nails at the same time.

Katherine