The A-plot is pretty standard monster of the week fare, with Barry hunting down a metahuman who was being executed when the accelerator's effects changed him and can now transform into a cloud of toxic gas. The notable thing about this villain is that in gas form he appears to be able to keep pace with Barry without dispersing. The title ostensibly refers to the past, but apparently covers sentient clouds as well.
The episode's strength is in the exploration of the past and the character beats it brings up. Barry has to accept that for all his speed, getting his dad out of prison is going to be a slow process, while Caitlin has to face the spectre of her fiance's death in order to go back into the accelerator. Dr Wells, meanwhile, is facing a past that is apparently everyone else's future.
Also of note in this episode is the metahuman containment facility, which I can only really describe as a monstrously inhumane and utterly illegal secret, private prison, in which - admittedly bad - metahumans are incarcerated without hope of appeal, visitation, medical care, changes of clothes or natural light.
Our heroes!
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