Part 2 of the 4 Night Event picks up where the we left off at the end of Supergirl. Now, what exactly would prompt Barry and Cisco to seek out Supergirl's help? I was certain it was going to be to take down another Superhero Villain. Isn't that how it always works out to be? Well, not in this case. It's literally an Alien Invasion taking over Earth. So right there, I consider this to be a win. It's something different from the norm. Even better is that we get a Team Vs. Team showdown, which is something I was not expecting to get either. By Team, I mean EVERYONE against The Flash and The Green Arrow. The ending with selected Superheroes being beamed aboard the Alien Mother-ship was a nice way to close out the episode and all but guaranteed that you will tune in for Part 3. The only negative I have about this episode was Wally West. I can't stand him at all. It's not just this episode, it's been every episode that has him in it. I just don't like the character or the actor that portrays him. Very annoying.