The CW has released an official description with spoilers for the November 13 episode of The Flash which is called “All Doll’d Up.”
Here’s the write-up.
BARRY AND IRIS TEAM UP TO STOP A DANGEROUS META NAMED RAG DOLL —Nora (Jessica Parker Kennedy) lets something slip about the future that devastates Iris (Candice Patton). In an attempt to distract his wife, Barry (Grant Gustin) asks Iris to team up to stop a new meta, Rag Doll (guest star Troy James). Meanwhile, Caitlin (Danielle Panabaker) learns something about her father. Phil Chipera directed the episode written by Thomas Pound & Sterling Gates (#505). Original airdate 11/13/2018.
UPDATE: We now have some preview photos including some creepy shots of Rag Doll! You can see them all below.