The Flash: 10 Questions Season 7 MUST Answer
10. How Will Barry Defeat Mirror Master?
The unexpectedly abrupt conclusion of Season 6 means that virtually all of its major storylines will spill over into the beginning of next season, and no storyline was more major to its impromptu finale than the rise of new Mirror Master, Eva McCulloch.
Finally out of the Mirrorverse that she spent all season (and the five years before that) trapped in, Eva exacted revenge on her husband, Joseph Carver, by killing him and once again assuming control of McCulloch Tech. While she's more than happy to let Team Flash continue to do their thing (for as long as Barry's speed holds out), she's warned them to stay away from her - which, knowing them, isn't even a remote possibility.
With the first few episodes of Season 7 essentially going to tell the story the writers had planned for the end of its predecessor, it's pretty clear that the end of Mirror Master's dominance is imminent. In order to move on with the show, the writers need to have the Scarlet Speedster take her down early on, but how can they make that happen when he's losing his speed?