Spoilers ahead for Tuesday's season finale of The Flash.
At the end of The Flash's first season, Barry Allen went back in time to fight Reverse Flash, but stopped short of preventing his mother's death, for fear of how that would alter his timeline. On this week's season two finale, he made the opposite decision, once again venturing into his past and saving the life of his mother, Nora Allen - echoing the universe-altering decision the comic book Barry Allen made in DC's comic book event series Flashpoint.
This decision came after the death of his father, Henry Allen, in the present, a twist that occurred earlier in the season. After confessing his love to Iris West, but saying he couldn't commit to her just yet, Barry ran back in time and saved his mother, likely changing everything - or at least some things - about the history of his world.
But that wasn't the episode's only major revelation. After masquerading as Jay Garrick all season, Zoom was revealed as Hunter Zolomo;, and his prisoner, the man in the iron mask, was unveiled as the real Jay Garrick - played by none other than John Wesley Shipp, the same actor who portrayed Henry Allen, and was the original TV Flash (and Barry Allen) over 25 years ago.
It's hard to say how this will affect CW's DC-verse. This may be CW's opportunity to fudge a few details, bring back lost characters, or even integrate new acquisition Supergirl into the rest of its DC shows.
On the other hand, this Flashpoint reference comes alongside the release of DC Universe: Rebirth #1, which aims to roll back some of the major changes instituted by the "New 52," the reboot that spun out of Flashpoint. If nothing else, it's a reminder that, even in comic books, these changes aren't immutable. And in network television, the status quo is likely to return - even if slightly tweaked - before long.