Season Four of the live-action superhero fantasy series The Flash premiered on the CW Network on October 10th, 2017. It ran for a full twenty-three episode season. This season sees the return of most of the series regulars beginning with Grant Gustin as the costumed superhero, The Flash, aka Barry Allen. Candice Patton plays Barry's teammate and fiancé Iris West. Danielle Panabaker is the schizophrenic Killer Frost, though most know her as medical know-it-all Caitlin Snow. Carlos Valdes is Cisco Ramon, aka Vibe, Tom Cavanagh reprises the role of Harrison "Harry" Wells of Earth-Two and Jesse L. Martin returns as Central City Police Department detective Joe West, who also happens to be Iris' father. Adding to the main cast line-up is Neil Sandilands who plays Clifford DeVoe. Based on the DC Comics character, The Thinker, DeVoe is the primary antagonist for this season. Departing from the show as a series regular is Keiynan Lonsdale as Wally West, though he still makes guest appearances throughout the season.
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