Finally! The Crystal Cuckoo is streaming on Netflix. Therefore, it is again a suspense thriller that the fans of the genre can occupy themselves with. Thus, the question arises: who are the main characters in this Spanish saga? Up to this point, the officially confirmed cast consists of Catalina Sopelana as Clara Merlo, Álex García, Iván Massagué, Itziar Ituño, Tomás del Estal, and Alfons Nieto.Javier Castillo's bestselling novel is being adapted into a closely knit six-part miniseries in which psychological intrigue is turned into mystery, and these actors are the ones to perform it. The saga narrates the story of Clara Merlo, a young intern in medicine whose life is completely altered after a heart transplant.Clara travels to a secluded, tiny Spanish village in her search to find out about her donor and gets entangled in the unmasking of killings, disappearances, and family secrets that are extending the tension. Jesús Mesas and Javier Andrés Roig have adapted, and Laura Alvea and Juan Miguel del Castillo have executed The Crystal Cuckoo, which has six parts that build up a captivating tale that teases the spectator to move back and forth from the very start to the end.The premiere date of the series was November 14, 2025. The film location was various places in Madrid and Extremadura, Spain.Here's a rundown on who plays whom in The Crystal CuckooCatalina Sopelana as Clara MerloCatalina Sopelana plays Clara Merlo, the leading lady. A heart transplant completely changes her life. Most of the developments in this series are kindled through her investigation into the donor, and Sopelana makes that evident through Clara's curiosity, emotive complexity, and psychological tension against secrets kept in the village.She is the anchor of the story, and most of the series circles around Clara's discoveries and interactions with the villagers. Sopelana brings determination and vulnerability to her acting, which makes Clara a compelling lead for such a thriller.Álex GarcíaÁlex García is part of the main ensemble cast. While the series does not flesh out details of the characters from official sources, García's role is quite substantial in telling the story, since his interactions with Clara support the unraveling of the mystery.García adds weight to the ensemble from his experiences in Spanish television and film, helping to keep the suspense and emotional depth going in this series.Iván MassaguéAnother important character who will appear in The Crystal Cuckoo is Iván Massagué, whose participation has been made official. Netflix hasn't detailed anything about his character, but he surely will introduce even more levels of psychological and dramatic intrigue into the plot.Massagué forms part of the team that provides a buildup of tension and drama in the whole plot of the six episodes.Itziar ItuñoThe confirmed main cast includes Itziar Ituño, popular for her work in Money Heist. She is one of the lead roles in interactions with Clara, adding a plot involving a town that further adds to the suspenseful storytelling of this story.Ituño gives experience and great depth to the ensemble that amplifies the tension in this thriller.Tomás del EstalThe other main cast member confirmed is Tomás del Estal, whose character contributes to developing the story. Events in the story support Clara's narration of her investigation. There is no official confirmation about her character.Alfons NietoRounding out the primary ensemble cast is Alfons Nieto. Without too much detail from the official sources, his performance crosses paths with Clara's journey to add to the suspense and psychological drama in the series.Like the other characters from this multi-formed cast, he adds to the plot without speculation about his backstory.Series background and production of The Crystal CuckooThe Crystal Cuckoo (El Cuco de Cristal) is a top-notch Spanish thriller that comes straight from Javier Castillo's bestselling novel. Jesús Mesas and Javier Andrés Roig worked together to write the screenplay, while Laura Alvea and Juan Miguel del Castillo make up the director’s pair.The miniseries of six episodes, which is exclusively distributed by Netflix, has already been promised to be vibrant and loaded with psychological drama, aside from the thrilling moments of suspense that will definitely be a part of it. Locations for the film are Madrid and Extremadura, which are very important to the series, as they will help in portraying the right atmosphere of a small town and its surroundings.Overview of the plot of The Crystal CuckooIn The Crystal Cuckoo, a heart transplant keeps medical resident Clara Merlo alive. Her intense curiosity regarding the donor's life turned into a quest to the isolated village where the donor had lived; nevertheless, she was soon to be plagued by unusual occurrences that were linked to the family's past.Clara's venture puts a spotlight on her family's case of disappearances, so strange that they are even called 'bizarre' and secrets that are buried for generations, all of which eventually become part of a complicated plot with suspense and psychological tension as its main components.The opening episode not only dramatizes the characters, their motives, and the topics that will be later unveiled, but it also hints at the entire thematic fabric of the series. Then, the audience is presented with a gradual revelation of the plot's complexity through Clara's investigation and the villagers' odd behaviors; with each episode, there is an unbroken increase of suspense and enigma.The Crystal Cuckoo consists of six episodes of uncertain suspense, psychological drama, and mystery. Not only will the audience become more engaged in the tale by identifying the characters and the actors playing them, but they will also have an easier time understanding the storyline.The known cast, a clearly outlined creative team, and a locale that heightens the suspense-these are all reasons that this series is surely going to be a quick and exciting thriller on Netflix.Also read: The Crystal Cuckoo ending explained: Yesques witnesses the fall of the predator, ending the decade-long terror