“There Will Be Blood” is the title of the October 29 episode of The Flash and The CW has released an official description to promote it!
You can find the write-up with some spoilers for this Halloween episode of the series below.
HALLOWEEN EPISODE – Barry’s (Grant Gustin) efforts to prepare Cisco (Carlos Valdes) for Crisis are derailed when Cisco schemes to save Barry’s life instead. Meanwhile, Ramsey Rosso (guest star Sendhil Ramamurthy) uses his deadly new abilities to save his own life, while sacrificing his humanity in the process. Marcus Stokes directed the episode written by Lauren Certo & Sterling Gates (#604). Original airdate 10/29/2019.