In The Flash episode “Trajectory,” while Iris (Candice Patton) gets a challenging new assignment from her new boss Scott Evans (Tone Bell), Barry Allen (Grant Gustin) and the team go out for a night on the town. They’re confronted by an unexpected speedster named Trajectory who’s causing serious damage, which is being misinterpreted as the result of The Flash’s behavior.
Eliza Harmon aka Trajectory is portrayed by Allison Paige. She’s best known for her roles on Days of Our Lives (Bev), Baby Daddy (Jenny DeLuca), and her character Gigi Darcy in Welcome to Sanditon, Domino: Gigi Darcy, and The Lizzie Bennet Diaries. The Flash airs Tuesdays at 8pm on CW.