In new photos from The Flash Season 6 finale, Eva McCulloch has evolved into her final form as Mirror Mistress.
Swathed in an ominous red light, the finale photos depict a massive battle that pits Eva, Ultraviolet, Sunshine and Dr. Light against Elongated Man, Harrison "Nash" Wells, Allegra Garcia and Sue Dibny at McCulloch Technologies. Meanwhile, Barry Allen and Black Hole leader Joseph Carver watch from a distance.
Notably, Eva is not referred to as "Mirror Master" in the photo credits. Instead, she is listed as "Mirror Mistress," which is simply a gender-swapped alternative for the character's original name from the comics. The photo offers only a glimpse of her new costume, but the design appears to draw heavily from a mirror theme -- which is appropriate, seeing as her metahuman ability allows her to travel through mirrors.
According to the episode synopsis for "Success Is Assured,"
THE FLASH SEASON FINALE -- Barry (Grant Gustin) considers a risky plan to save Iris (Candice Patton) from the Mirrorverse. Ralph (Hartley Sawyer) attempts to stop Sue (guest star Natalie Dreyfuss) from making a grave mistake that could destroy her life. Phil Chipera directed the episode written by Kelly Wheeler & Lauren Barnett (#619). Original airdate 5/12/2020.
Airing Tuesdays at 8 p.m. ET/PT on The CW, The Flash stars Grant Gustin, Candice Patton, Carlos Valdes, Danielle Panabaker, Tom Cavanagh, Jesse L. Martin, Danielle Nicolet and Hartley Sawyer.