The Flash's new big bad, the Red Death, has a confounding line in the latest episode of the Arrowverse series that actually serves as a fun reference to one of DC's most classic films. The speedster villain has made quite the impact in her first few episodes of the series, which is in the midst of its ninth and final season, proving the colossal threat that she poses to Barry Allen (Grant Gustin) and the other members of Team Flash. As the battle between the Red Death and the Flash heats up, the conniving villain manages to sneak in a nod to a beloved DC project.

https://screenrant.com/the-flash-show-red-death-keaton-batman-reference/