Aster Calyx (Headey) is a government agent while Halan Kai Nelson (James) is a stoic ex-military man.

Source: https://tvseriesfinale.com/tv-show/beacon-23-season-one-viewer-votes/

Game of Thrones star Lena Headey, who played Cersei Lannister starting in season 1, says she's glad the mania slowed down for the fantasy series.

Source: https://screenrant.com/game-thrones-fan-excitement-lena-headey-response/

It’s a slow opener, but the impressive cast includes Lena Headey and Domhnall Gleeson.

Source: https://www.theguardian.com/tv-and-radio/2023/jun/04/succession-final-episode-finale-review-the-gallows-pole-shane-meadows-changing-ends-alan-carr-university-challenge-jeremy-paxman

You’ve said before that Lena Headey made a choice in a scene that helped to inspire a whole new story.

Source: https://www.thewrap.com/beacon-23-season-2-finale-glenn-mazzara-aster-spoilers-mgm-plus/