The timeline re-writing and time travel behind Barry’s trip into becoming Savitar is helpfully illustrated, as always, upon the S.T.A.R. Labs whiteboard – in this case, by Cisco Ramon. For those who recall Barry’s trip to 2024, he set out to discover just how he and his friend managed to defeat Savitar (as they clearly had, since there was no mention of him in the infamous future newspaper in their possession). The results weren’t as hopeful as expected, with the team disbanded, scarred, and broken. Savitar had been caught alright, but not before he killed Iris.