The prequel series Blood of My Blood, which has been airing since 2025, explores the romantic relationships of Claire's parents, Henry Beauchamp and Julia Moriston, as well as those of Jamie, Brian Fraser, and Ellen Mackenzie. The second season is set to debut on September 19 on HBO Max. During filming in Scotland, the production team opened its set for a few days, giving fans and journalists a glimpse into how the show is made. One of the scenes filmed last was the meeting between Brian and Ellen in a stable. This allowed the cast to build on the chemistry they had developed during the first season. Jamie Roy, who portrays Brian Fraser, mentioned that the scene had been filmed earlier in production but was redone for creative reasons. The team had initially auditioned for this scene at the beginning of filming. The set design in Blood of My Blood includes subtle references to the original Outlander series, especially on the ceilings, which sometimes hint at future plot developments. Seamus McLean Ross, who plays Colum Mackenzie, originally auditioned for the role of Brian Fraser but felt Colum was a better fit. The production team has humorously compared the castles in the series to TripAdvisor reviews, with Beaumont Castle rated five stars, Leoch Castle three stars, and Leather Castle one star. Art director Mike Gunn joked that even the least impressive castle could now be considered a stylish Airbnb. Internally, the team refers to the series by the nickname "Bob" instead of its full title. All intimate scenes are carefully choreographed by an intimacy coordinator, with actors receiving detailed instructions and storyboards for each shot. The costume department has a dedicated "breakdown team" that works to make the costumes look more realistic by softening fabrics and using special techniques. To save money and reduce environmental impact, the production team recycles sets and costumes, reusing some from the first season of Outlander for battle scenes. The set decorators focused on creating realistic but less toxic candles, using LED versions for wide shots. The casting team also did extensive research into Scottish history to prepare the actors, uncovering interesting facts such as the historical illegality of refusing toilet access to others in Scotland. The second season of Blood of My Blood is set to release on September 19 on HBO Max.