The 100th episode of The Vampire Diaries airs tonight (January 23) as the entire gang at Mystic Falls gets together to memorialize a dying Katherine Pierce. Katherine’s presence on the series, going all the way back to Season 1, has always given the show a jolt of energy; as she expires, a lot of that energy is remembered both fondly and with amusement by the other characters.

Here are some teasers that might be slightly spoilery to get you in the mood for tonight:
1. Callbacks. We already know Joseph Morgan’s Klaus factors in somewhere, and apparently it has also been announced that Michael Trevino’s Tyler is back. But don’t be surprised if other faces or moments from the show’s past 99 episodes are revisited. There’s a lot of territory to mine there. “Remember when Katherine cut Uncle John’s fingers off? Remember when Grams died trying to open a tomb that Katherine wasn’t even in?” That sort of thing. So much fun. As the characters reminisce, you, too, will as a viewer.
3. Even on her death bed, Katherine is still feisty. If Katherine is going to die, I’m going to miss Nina Dobrev’s dual performance here. Even without her power, and physically weakened, Katherine is a force to be reckoned with.
4. Also moving forward. I mentioned that I liked the callbacks; however, the other thing I liked here is that this episode propels the next 100 (or however many) episodes. Some cool elements are set up for what can come later, and it’s good for a lapsed viewer like me.
6. Sex. That’s why you all want to catch VD, right? There might be sex. Or at the very least, some talk about it.
The Vampire Diaries’ 100th episode airs tonight at 8PM on The CW. Take a look at some promo images here!