Episode Description: The metahuman that killed Barry’s mother returns, killing two guards at Mercury Labs in search of the company’s work in tachyon particles. Barry witnesses the man in yellow, and engages in a high speed fight around the city. The man in yellow insinuates to Barry that they know each other before speeding off. Meanwhile, Eddie asks Iris to move in with him and Ronnie is revealed to have survived the particle accelerator explosion, but does not remember who he is and has the ability to burst into flames. Barry confesses his love for Iris before the police and S.T.A.R. Labs use the tachyon particle technology as bait to lure the man in yellow into trap. The man in yellow escapes and attacks Dr. Wells and the police before engaging in a second fight with Barry. Ronnie appears and blasts the man with flames before both flee the scene. This event cause both Cisco and Joe to realize that there was another speedster in red with the one in yellow that night when Barry’s mother was murdered by the latter. Later, Dr. Wells enters his secret room and unveils the same yellow suit as the man that they captured, placing the stolen tachyon technology on the suit’s chest.
News: Mark Hamill returns in a brand new interpretation of James Jesse (aka The Trickster)