Mystery Girl on 'The Flash' Is A [SPOILER]!

The Flash‘s Mystery Girl just revealed her biggest secret of all on last night’s episode – she’s a speedster!

During the episode, during a baby shower for Joe and Cecile’s new baby, Mystery Girl shows up at the door with a gift for them, from “someone who realizes time is precious.”

Then, she seemingly disappears from the doorway and fans see her just around the corner, where she waits a moment before she really vanishes – with a streak of red, yellow, and almost purple lightning following behind her.

While many theories have hinted at Mystery Girl being Barry and Iris’ daughter Dawn, or even their granddaughter, Jenny Ognats – she could well be Joe and Cecile’s daughter as well.

Mystery Girl did mention that their child was arriving in 21 days (aka The Flash finale) – and who else would know that but their actual daughter?

We shall have to wait and see what happens!

TELL JJJ: Do you have any more theories on who Mystery Girl is?