I hate to be totally obvious but so far, Reverse Flash Returns is my favourite episode. I think that they could have done more with Eobard and there was a lot of scientific dubiousness / outright made up stuff but it was still really fun to watch.
In season 1 it would be a toss up between Out of Time and Tricksters as I thought both were really good.
However, I also loved Welcome to Earth 2. I just love the style of Earth 2, it’s so classy.
But I did have issues with the episode itself. Such as Barry thinking with his dick. Pretending to be someone else and making out with their partner is assult and I think it’s a new low for Barry. We don’t know how far they got, but when E1 Barry and E2 Iris got home, she changed into a silk nighty and then the next scene they are going out for the evening. You don’t change into a silk nighty for no reason. But if I found out that I had been having romantic, emoitonal and intimate moments both physical and not with my partner’s identical twin, I would feel incredibly violated and report him to the police. I really hope that Iris slaps E1 Barry at the very least.
Sorry, went off on a little rant there 😛