https://screenrant.com/flash-season-9-danielle-panabaker-new-character-details/

The Flash Season 9 premiere ended with the revelation that Danielle Panabaker, who played Dr. Caitlin Snow and Frost, is playing a new character.

It Took 9 Seasons, But The Flash Finally Has A Proper Rogues Gallery (https://screenrant.com/flash-season-9-rogues-gallery-red-death-captain-boomerang/)

With the introduction of the new Captain Boomerang, Owen Mercer, The Flash season 9 has formed a Rogues Gallery worthy of the team’s comic book legacy