In the The Flash Season 1, Episode 16, the narrative explores the "butterfly effect" of time travel after Barry Allen accidentally runs back in time 24 hours while trying to stop a tsunami. Summary of the "New" Timeline
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:
For more details on the episode's production and cast, you can check the "Rogue Time" entry on IMDb . "The Flash" Rogue Time (TV Episode 2015) - IMDb