Mark Mardon, brother of Clyde Mardon, kills the city's coroner with one goal in mind: to get the name of Joe West, the man who killed his brother. Receiving word and breaking his impromptu double-date with Linda, Iris and Eddie (where Iris and Barry's close behavior equally disturbs their dates), Barry freakishly sees himself running beside him en route to the crime scene at superspeed. Joe, knowing the impossibility of protection against meta-humans, works the case but is captured and used to lure Iris to the beach. Meanwhile, as Police Captain Singh winds up hospitalize in trying to protect Joe, Cisco pays dearly for pursuing his suspicions against Harrison. Back at the beach, Iris finally learns the identity of The Flash as Barry tries to thwart Mark's tsunami, hurtling toward the city, and winds up meeting himself en route to the coroner's office instead.