Finally, Barry Allen (Grant Gustin) can sleep soundly -- knowing at least one major timeline change isn't his fault. In the first part of the "Invasion!" crossover, it's revealed that Professor Stein (Victor Garber) now has a daughter. But how did she get there?
The key comes from the episode description for the "Legends of Tomorrow" segment of the crossover. "[Stein] is distracted by the aberration he realizes he created in 1987."
While the "Invasion!" episode of "The Flash" led to many being disgruntled with Barry for the events of Flashpoint -- Diggle (David Ramsey) has a legitimate gripe with the speedster, for erasing his daughter -- Stein is the only one to blame for the changes in his life.
Honestly, that should go a long way in showing that while Barry may have acted selfishly in creating Flashpoint, he's not the only one that has misused time. Sometimes people simply can't help themselves when it comes to major moments in their own life.
We've had a lot of fun painting Barry as "The Flash's" biggest villain because of the terrible things that happen when he goes back in time. Sometimes it just can't be helped, though. At the end of the day these people are humans -- sans Kara (Melissa Benoist), of course -- and humans are flawed.
But what happens from here? This change in Stein's life is a major one and given his science-driven mind, it's not likely to be something he just lets go. Will he want to fix the "aberration"? Can he bond with his daughter? And if the aberration "distracts" him from the task at hand, defeating the Dominators, how can he focus on the greater good long enough for the assembled superteam to save the day?
Let the "Invasion!" crossover continue... On "Arrow's" 100th episode Wednesday, Nov. 30 at 8 p.m. ET/PT on the CW.