Craith

Four of the major cast members of season 1 appeared in season 3 of the Welsh detective show Hinterland. Sion Alun Davies (DS Owen Vaughan) and Gwyneth Keyworth (victim Megan) played the son and daughter of a murdered preacher in episode 3.1. Sian Reese-Williams also appeared in that episode, as well as others, as a hotel owner. And Rhodri Meilier (predator Dylan) appeared in episode 3.2 as the boyfriend of a murder victim (Reese-Williams was also in that episode).

Two language versions filmed together: First broadcast in Welsh version (Craith), followed by English/bilingual version (Hidden).