: Barry’s attempt to fast-track a relationship with Iris backfires. In the previous timeline, the impending disaster forced a confession from her; without that pressure, his advances lead to a rift between them and a punch in the face from Eddie Thawne. Key Themes and Stakes
: Leonard Snart ( Captain Cold ) and Mick Rory ( Heat Wave ) return to Central City, joined by Snart's sister, Lisa Snart (Golden Glider). [S1E16] Rogue Time
: 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. : Barry’s attempt to fast-track a relationship with