I have to assume this took some doing to get a character from CW onto a CBS show, but boy did they do it well. When this episode began, Barry Allen showed up with a device on his chest and a quick answer to the problem that these two superheroes have never heard of one another. Of course Barry is from a different Earth.
This was all of the back story we needed. Now for the current story in Supergirl, we have been following the decline of Siobhan Smythe into Silver Banshee. This episode was seamless into that storyline, not only carrying on the main story but making it a natural fit for The Flash to need to assist in the capture of Silber Banshee and Live Wire. Barry brought in his knowhow, and was able to assist in a very big way, with both creating ear plugs that will stop Banshee’s scream, and also the mention that Barry gave the police department the ability to hold meta-humans. This was a point of contention between Kara and James as he didn’t like the DOD holding people without trial, even if they are super bad.
In terms of writing, I think this is one of the best Supergirl episodes to date. The dialog was great, including some fantastic one-liners by Cat Grant, where she comments that the team standing around her office looked like a pretty racially diverse show on the CW. Of course, having the quick wit of Grant Gustin worked so well as Barry and Winn had a great time playing off one another with their nerd talk. There were such cute moments as well, such as when Barry began to explain the multiverse, and Winn and Kara looked as giddy as school girls to hear him explain it. They showed almost all of the main characters in this episode with the exception of Kara’s sister Alex, who is missing for some unknown reason. Overall this episode was so well done, that is blends well into the existing story line. Will Barry ever mention the outing to this alternate Earth at some point on the CW?
I am really hoping that this really is the beginning of DC tying their universes together. Marvel has done such an amazing job of bringing their movies and TV together, with mentions going both ways. DC has seemed fractured over the years with no cohesion. The Flash and Arrow has done a great job of bringing their two shows together with yearly crossovers and guest spots, and now they have brought Supergirl into the fold, if ever so slightly. As Marvel continues to dominate the theaters and TV with the weight of Disney thrown behind it, DC started on the back foot, especially with a bit of recent casting kerfuffle when they showed a different Flash for the movie universe. I get that DC is known for having a multiverse, but they have to be careful not to keep it too fractured.
This crossover is hopefully a sign of the times for DC in the future.