They were having gruesome fun at a ball in the Regency era when they were interrupted by Rogue, a bounty hunter, and the Doctor. The Chuldur nearly killed Ruby, but she was able to fight back.

Doctor Who episode "Rogue" heavily references Bridgerton through storylines, characters, & music. The Doctor & Rogue devise a scandalous plan to draw Chuldurs, similar to Bridgerton's shock value.