The Flash- Going Rogue

This episode gets a few bonus points thanks to the presence of Felicity Smoak making a guest appearance, taking a break from her work with the Arrow to catch up Barry. The "previously on" segment at the start was a nice reminder of Barry's appearances on Arrow, as well as Cisco and Caitlin's cameo later on.

There was a good amount of chemistry between Felicity and Barry, and it was nice to see them catch up. It's unfortunate that they're both crushing on somebody else they can't have. (Felicity on Oliver, Barry on Iris.) I don't think it's impossible for them to hook up again, but even if they gave up on their unrequited loves, we can't expect Felicity to leave Starling City every other week (even if it is just a quick jog for Barry).

Joe's been a little on edge since he found out Eddie was dating his daughter. He's trying to adjust, but they're both cops in a city where crime is just going to get dangerous. It makes sense after he lost his partner in the first episode, and the idea that one of them might get hurt and cause Iris grief is not something he wants to live with. Nonetheless, Eddie's still a good cop and has Joe's back, even after he tried to keep him on the sidelines.

We're also introduced to Leonard Snart, Captain Cold. He's the first villain in the series who isn't a metahuman. His cold gun was an invention of Cisco's that was stolen from STAR Labs. Since they didn't know who Barry was at the time, Cisco built it to counter Barry's super speed, since friction and heat are impossible at absolute zero. This episode's also a first in that the villain gets away, without being killed or captured. Snart noticed the Flash's concern for civilians and used that to keep him busy, leading to an amazing rescue as Barry pulls people out of a crashing train as it barrel rolls.

Harrison Wells was seemingly absent during the stinger in this episode, but it did show how Snart's henchman obtained the cold gun. This might mean there's another person in STAR Labs who's collaborating with Wells in his attempt to ensure the Flash's existence. There's still a lot of questions that need to be answered about him. I'm looking forward to finding out what those answers are.