With DeVoe's Enlightenment device nearly complete, in order to disable it The Flash (Grant Gustin) and his team must put their faith in an unlikely ally -- Amunet Black (guest star Kattee Sackhoff). Meanwhile, Harry (Tom Cavanagh) hits an all-time low when the "Council of Wells" kicks him out but then Cisco (Carlos Valdes) introduces him to the "Council of Harrisons."