Frost (Danielle Panabaker) must find a way to clear her name after a mysterious, ice-powered enemy frames her for a brutal crime in the new episode "Growing Pains." Elsewhere, Barry and Iris (Grant Gustin, Candice Patton) have a surprise houseguest, while Joe (Jesse L. Martin) must continue to deal with Kristen Kramer (guest star Carmen Moore). Carlos Valdes and Tom Cavanagh also star.