It looks like Barry and the S.T.A.R. Labs team have their hands full again as they work to capture Kyle Nimbus, a.k.a. The Mist, a dangerous new meta-human with toxic gas powers! They revisit the painful night the particle accelerator exploded and killed Caitlin’s fiancé, Ronnie (SPOILER ALERT: in the comics becomes Firestorm). Joe decides to finally visit Henry in jail after all these years, but things take a dangerous turn when Kyle shows up looking to punish Joe for arresting him years ago. Meanwhile, Iris and Eddie continue to hide their relationship from Joe.