In the wake of the latest particle accelerator mishap, both Wally and Jessie were hit by a blast of energy. While Wally seems unaffected, Jessie lies in a coma, just as Barry did after his accident. They are not the only ones affected by the energy; deep in the S.T.A.R. Labs morgue, Girder’s body is reanimated as a zombie metahuman who immediately starts to hunt down Iris.
Now don’t quote me as I was never a heavy reader of the Flash comic but I don’t recall the Speed Force ever being portrayed as an actual sentient being so the TV show is doing a different take. And while it comes in the form of a bit of Deus Ex Machina hokum it is an interesting idea. Of course, it also presents the problem that if the Speed Force is seemingly a benevolent being that aids Barry why doesn’t it then stop Zoom?
Barry eventually has to come to grips with the death of his mother and it includes an overly sentimental scene where Barry and a manifestation of his mother read his favorite childhood book. It was classic comic book melodrama, however, from Smith who understands the place for this type of story and respects the material. Speaking of Zoom, the episode concludes with a shot of the villain raising an army of Earth-2 metahumans. One of these will be none other than the Earth-2 Black Canary known as Black Siren and played by Katie Cassidy.