After Ronnie attacks a physicist, Barry and the team realize they need to go after Caitlin's fiancé who is now a dangerous meta-human. Barry struggles to balance his duties as The Flash and his relationship with Linda Park. Joe enlists Cisco's help to reinvestigate the murder of Nora Allen. General Eiling returns to Central City.
Elenco: Grant Gustin , Candice Patton , Danielle Panabaker , Jesse L. Martin , Carlos Valdes , Tom Cavanagh , Danielle Nicolet , Kayla Compton , Brandon McKnight , Hartley Sawyer , Rick Cosnett , Tom Felton , Keiynan Lonsdale , Jessica Parker Kennedy , Jon Cor .