"There’s a lot of scared people with this monster running around the city."
Iris West
"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.[src]



Special appearance by

Guest starring



Eddie Thawne's photograph on the wall of SCPD

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

  • A photograph of Eddie Thawne can be seen on the wall at CCPD.
  • Cisco makes yet another Star Wars reference in this episode, but H.R. does not catch on. This is the same reference made by Spider-Man in Captain America: Civil War.
  • This is the only episode of the season to feature Patrick Sabongui (David Singh).




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