In a recent interview IGN, Nina Dobrev dishes about Klaus's imminent appearance and what that will mean for tomb trapped Katherine. "The Vampire Diaries" has found their Klaus with Joseph Morgan, so it's only a matter of time before he makes his appearance in Mystic Falls.
IGN: With the rising threat of Klaus, it puts a different spin on things with Katherine, because now there’s a potential threat to her and makes her current enemies possible allies against a common foe. Going forward, how are things shifting as far as the group maybe needing Katherine and her possibly needing them?
Dobrev: That’s exactly it. That’s the thing. She is stuck in the tomb and is contemplating and strategizing. But there’s only so much you can do. It’s not like she has a cell phone and can call up her buddy from who knows where. She has to be really creative and she’s running out of ideas and she’s getting frustrated and angry and she’s dirty and moody. And she’s not a happy camper right now and she’s also scared, because Klaus is coming after her and he’s the only person Katherine is truly afraid of. So it’s like a ticking time bomb and she’s just waiting for it to explode, because she is helpless. Katherine is not used to being helpless and she doesn’t like being in that position or feeling that way.