The Flash - 'The Reverse-Flash Returns'

"Best three out of five?"

When Harry tries to help Cisco by scaring him into Vibing, he gets a vision of the return of the Reverse-Flash, Eobard Thawne (using his own face this time, but the same yellow suit and red eyes.) Naturally this is both distressing and confusing for Barry and co, who assumed he was not just dead but never born (although what's most confusing for me is that he's still using the AI that now claims to have been designed to run the Waverider in Legends of Tomorrow,) but Harry speculates that Thawne's timeline must still exist prior to his defeat, and that this must therefore be an earlier version of the villain who hasn't stopped existing yet, and will murder Barry's mother before he does.

While they work to save British science lady from Thawne, Barry is also working through the Patty issue by acting like a jerk. Seriously; I have no patience with this shit because he should have told her he was the Flash weeks ago. Joe I can forgive, because it's Barry's secret to tell, but at a certain point the silence becomes deception and at that point Barry can fuck off and stop pouting. I'm sorry, but that's how I feel on the matter, not least because it's just manufacturing Arrowesque angst to get on my shiny superhero show.

Breathe. Just breathe.

Harry makes Cisco a set of goggles to induce and control his Vibing, allowing him to not only locate Thawne but to Vibe on the future and get Barry to Thawne before he can kill British science lady and escape to the future using a tachyon accelerator. Unfortunately, locking him up truncates his timeline and begins to kill Cisco, so Barry has to let him out and help to accelerate him through time to his destiny of killing Nora Allen, becoming trapped in time and finally ceasing to be.

While it advances personal plots for Cisco and Jay (as Caitlin tries to locate his duplicate to act as a cell donor, only to learn that his duplicate a) was adopted and named Hunter Zolomon*, and b) isn't a genetic match due to not being exposed to the Speed Force,) much of this episode is just marking time while Barry lies in the face of his ludicrously understanding girlfriend and tries to perpetuate the shield of secrecy myth (if she didn't know he was the Flash, the only effect would be that she would be slightly more confused when Zoom dissolved her into her constituent atoms.) While he is a much-loved familiar face (only, you know, with a different face) Reverse-Flash isn't really a threat and doesn't add anything obvious to the arc plot (although the whole residual timeline thing may become important elsewhere.)

* Some people just shouldn't be allowed to adopt.