https://screenrant.com/cobalt-blue-flash-season-8-credits-scene-setup/

The Flash season 8's post-credits scene sets up a long-awaited DC Comics villain to finally join the Arrowverse. Will he show up in season 9?

The Flash Season 8 Finale's Big Cameo Wasn't A Surprise, So Why The Hype?! (https://screenrant.com/flash-season-8-finale-damien-darhk-cameo-disappointing/)

A shocking cameo was promised for The Flash season 8 finale, but it unfortunately didn't even come close to the surprise it was hyped up to be.