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The Reverse-Flash Returns 

Episode Summary:
Cisco works with Harry to stabilize his "vibe" power, and gets a vision of Eobard Thawne killing Dr. McGee. The team soon realizes that Reverse-Flash is back... from a time period before he killed Barry's mother. Meanwhile, Iris says goodbye to her dying mother and suggests that Wally do the same, and Patty prepares to leave Central City.