: Eobard Thawne (posing as Harrison Wells) warns Barry that time is a fickle thing. He explains that "saving" one person often results in the universe finding a "replacement" for that tragedy. This is tragically realized when the reporter Mason Bridge—who was investigating Wells—is murdered instead of Cisco.
Having lived through a tragic version of the previous day—where Joe West was kidnapped, Cisco Ramon was murdered by Dr. Wells, and Iris West confessed her love for him—Barry attempts to "fix" everything by using his knowledge of the future. However, his interference creates a different set of problems: [S1E16] Rogue Time
: In this timeline, the Rogues kidnap Cisco and his brother, Dante. To save Dante’s life, Cisco is forced to rebuild the Rogues' elemental weapons and, more critically, reveal Barry Allen's secret identity to Snart. : Eobard Thawne (posing as Harrison Wells) warns