Mother

"Mother"^[1] is the third episode of the seventh season of The Flash, and the one-hundred-thirty-sixth episode overall.

Synopsis

As Eva becomes more powerful, Barry and team must find a way to stop her. They are shocked when an old friend – Sue Dearbon risks her life to help.

This episode was originally meant to be the finale of Season 6. Meaning the Mirror Mistress storyline will get wrapped up.
The episode's title is likely an homage to how the mirror clones call Eva "mother".

↑ "The Flash - Season 7 - First 5 Episode Titles Revealed" - Spoiler TV
↑ ^2.0 ^2.1 Cite error: Invalid <ref> tag; no text was provided for refs named Futon

The Flash season 7
Reflections and Lies
"All's Wells That Ends Wells" • "The Speed of Thought" • "Mother"
God Complex
"Central City Strong" • "Fear Me" • "The One With The Nineties" • "Growing Pains" • "The People v. Killer Frost" • "Timeless" • "Family Matters, Part 1" • "Family Matters, Part 2"
Interlude I
"Good-Bye Vibrations" • "Masquerade" • "Rayo de Luz"
The Godspeed Imperative
"Enemy At the Gates" • "P.O.W." • "Heart of the Matter, Part 1" • "Heart of the Matter, Part 2"