"Monster" is the fifth episode of the third season of The Flash, and the fifty-first episode overall. It aired on November 1, 2016.


Desperate to understand what is happening to her, Caitlin visits her mother, Dr. Tannhauser, a renowned biomedical researcher, in the hopes that her mother can provide some answers about Caitlin's growing meta-human powers. However, when Dr. Tannhauser treats her daughter like a test subject, Caitlin grows cold and brings up past wounds causing the two to have a major blowout. Meanwhile, after a mysterious new meta-human attacks Central City, Barry tries to convince Julian to let him assist on the case.[1]


Eddie Thawne's photograph on the wall of SCPD

Eddie Thawne's photograph is in the upper right corner of the screen.

  • A photograph of Eddie Thawne could be noticed on the wall in SCPD.
  • H.R. says, "Has there been none amongst you that has ever shaded the truth for what you believe to be the greater good?", 'Shade' is the title of the next Flash episode.
  • Cisco makes yet another Star Wars reference in this episode, but H.R. does not catch on.




  1. The Flash Spoilers: “Monster” Description – We Meet Caitlin’s Mom! - FlashTVNews