You didn't think the CW would just let Melissa Benoist's amazing singing voice go to waste did you? Thanks to their little journey into musical theater last year, Barry decides to have Kara sing at his wedding, and we guarantee you're not prepared for how awesome it is.
4. The WestAllen rehearsal dinner is... eventful
We can't tell you exactly what goes down the night before the wedding, but we can tell you it's pretty insane. Some over-indulgence occurs, some fights are had, and most importantly, some souls are bared during the speech section of the evening.
What you might not know is that this wedding has another very mysterious guest whose intentions seem far less deadly than the other crashers. Keep your eye out for an adorably awkward caterer who approaches Barry to help calm any pre-wedding jitters, because this girl seems way too jazzed to be watching Iris (Candice Patton) and Barry (Grant Gustin) take their vows.
We've got our theories about who she is — not to mention what her connection to Barry and Iris could be — but we'll keep them to ourselves for now. The fact that she's played by Jessica Parker Kennedy (The Secret Circle) should give you a hint though.