Were you too busy planning your Cinco de Mayo party to watch The Vampire Diaries? Well, you missed some big — and gruesome and heart stopping — moments in Season 4, Episode 21, “She’s Come Undone.” Seriously, we’re still a little shaky.

But it’s OK. The episode is available on The CW’s Vampire Diaries site or you can get it from iTunes here. So why should you watch it? So many reasons! First, Elena (Nina Dobrev) is being her new, nasty self. Everyone’s invested in getting her emotions turned back on, and even Katherine (Nina Dobrev) shows up to give flipping the humanity switch the old college try.

What else can we tell you? Caroline (Candice Accola) has a serious scare — or seven. And Bonnie (Kat Graham)... Well, the witch is going rogue. She’s determined to solve this Silas thing, and she ends up with an unexpected ally.

If all that wasn’t enough to convince you, we don’t know what will! Get thee to The CW and watch on. How else will you be ready for Season 4, Episode 22, “The Walking Dead”? Let’s just say Mystic Falls is about to get very... spirited.

Sources: The CW, iTunes, Sidereel