It ' s worth noting that they have already reused an actor , the girl who plays Selma I guess I ' d like to be as big as Selma one day in 15 Million Merits also plays Sonja in Playtest . According to imdb she also has a role in season 4 . I think that ' s the right way for the show to do it , I wouldn ' t mind some , not all , secondary or bit part characters being the same actor but I don ' t think they should recycle the main cast of an episode . The main character is usually shattered in some unforgettable way and I don ' t think many viewers would be able to disassociate the actor from whatever first episode they saw them in . <| sep |> Feelings are silly and so is my crush , I think not giving it power is great advice , luckily I ' m not going to see her until January so that should hopefully help me get forget about it