But then, if Mystery Girl isn’t related to the Speed Force, then what was she doing writing down those weird symbols that Barry was scrawling in the season premiere?
This makes me want to rethink all of my previous theories, but then to defend them all at the same time.
If Mystery Girl will indeed factor into Season 5 in a meaningful way, as Todd Helbing implied to TVLine, she’s probably not a time-traveling speedster, since that would create timeline problems for the Speed Force.
Of course, time travel could still enter into it, since the Legends of Tomorrow crew doesn’t use the meta super-speed to dip into the past, but we’ll leave the Waverider out of this for now.