Michelle Morgan played "FRAN", the "Friendly Replicator Android". Morgan was originally set to play Linara, Davos' daughter from a previous episode, "The Seer". However, the role was given to Kimberley Warnat when Morgan had to participate in a reshoot of her role in "Diary of the Dead". Morgan was disappointed that she did not get the role of Linara, but stated after her casting as FRAN that it was fun to play a character that is highly dangerous and yet completely innocent. Jill Wagner returned as Larrin for this episode, after her debut appearance in "Travelers". Torri Higginson returned as Elizabeth Weir in her fourth appearance in the season, at the very end of the episode. The script intended her to have two lines of dialog in the episode, but producers knew that the audience would recognize Higginson's voice and hence used a stand-in to say the first line instead.