It's cross-over time! The Flash and Arrow, CW's hit superhero dramas, are set to join forces once again in a two-episode arc this week. It all gets underway on Tuesday night with the brand-new episode of The Flash, titled "Legends of Tomorrow," and things are going to get a little crazy. Of course, so many superheros in town means one thing; more villains. Get ready for an onslaught of bad, coming at our heroes from just about every angle as arcs that have been laid out over the past few weeks, finally, come to fruition. As if that wasn't enough, we've got more than a little bit of romance to look forward to as well. Click through the rest of the gallery to read up on the latest spoilers for night one of the two-day special. The Flash airs at 8 p.m. on The CW. (Diyah Pera/The CW).