To learn why Nora joined forces with Eobard, Team Flash reads her journal. They discover that in 2049, Eobard was the only person who was honest with Nora, and taught her how to use her powers.

The Flash

Season Number: 5

Episode Number: 18

Episode Title: Godspeed

Air Date: Apr 16, 2019

Source: The.Flash.2014.S05E18.1080p.HDTV.x264-LucidTV