| cinematography = | camera = | runtime = 54 minutes | channel = | first_aired = | last_aired = | related = }} is a Japanese medical drama that premiered in October 2012 on TV Asahi. It stars Japanese actress Ryoko Yonekura.

The series ran for seven seasons until December 2021, with a total of 69 episodes and one special. It is one of the longest-running medical dramas on Japanese television, notable for its consistent high ratings and enduring popularity throughout its broadcast period.

A continuation, Doctor-X: The Movie, was released in 2024.

Plot The show follows Daimon Michiko, a freelance surgeon who works at university hospitals in Japan. Also known as Doctor-X, Daimon is introduced at new hospitals by walking into surgery staff planning review sessions, where the conditions of her work are established. She is depicted as challenging a medical system in crisis, which follows the laws of the jungle.

Her trademark line is "I never fail", and she is willing to do high risk surgeries that other surgeons are not, sending those patients elsewhere when they are deemed non-operable. Her success in treating high risk patients is a result of always putting the patient first, prioritizing their health above performing medical firsts or innovative techniques, and to adapt the right surgical methods on the spot when needed. This practice often puts her into conflict with other doctors. Beyond being a surgeon, she also served as a vet, combat surgeon and resort doctor. Daimon is supported by her manager Akira Kanbara and anesthesiologist Hiromi Jōnouchi.

First season Daimon Michiko, a lone wolf freelance surgeon who hates authority and groups, joins Teito III University Hospital, where her way of practicing results in conflict with hospital administrators.

Second season Daimon continues her practice of doing risky surgeries to benefit patients. This practice continues to create conflict with hospital administrators.

Third season A vicious political struggle is underway at Japan's National Advanced Medical Center (NAMC) between the East's "Totei University Hospital" and the West's "Seikyo University Hospital". Daimon is brought in to try to minimize these conflicts and bring a more patient-focused approach.

Fourth season Daimon returns in the fourth season to the Totei University Hospital. Shigekatsu Hiruma serves as the primary adversary for Daimon.

Fifth season Daimon returns to Totei University Hospital to assist in bringing a more patient-driven approach. Her main antagonist is the Japan Doctor's Club chairman.

Sixth season Daimon clashes with Totei University Hospital's new administrator Nicholas Tange, (a 2nd generation Japanese-Brazilian, "The Vulture"), whose aggressive cost-cutting threatens the integrity of the hospital.

Seventh season Coming back from New Zealand, Dr. Daimon returns to Tōtei university hospital amidst the COVID-19 pandemic. The internal medicine department is now a priority over surgery with Dr. Hachisuka leading it.

Cast The show stars Ryōko Yonekura as Doctor-X – Daimon Michiko. Yonekura was a former fashion model who had performed as the first Roxie Hart in the Japanese theater production of Chicago in 2008. After learning English, Yonekura made her Broadway debut in the same role in 2012 and reprised it in 2017. The actress has said that she overuses her character's catchphrase, “私、失敗しないので" (“I never fail") in her personal life. Yonekura also sees the character as a lighter, less stressed and more free reflection of herself.

Shirō Itō and Ittoku Kishibe were both veteran actors who joined the cast for the first season.

Yuki Uchida appears in all 7 seasons playing Hiromi Jonouchi, an anesthesiologist who works for the same agency as Michiko Daimon.

Ryōko Yonekura, Takeshi Kitano and Kei Inoo all appeared in the special. Takeshi Kitano returned to acting after a two-year absence for his role in the special. He had taken time off to work behind the camera. Michiko Tanaka was also a regular in the fourth season, playing the secretary of the hospital director. Tanaka was nervous during the whole three months of filming for the season because she had to work with Toshiyuki Nishida.

The fourth season also starred Toshiyuki Nishida as Shigekatsu Hiruma. He had previously appeared in Nobunaga Concerto and State of Union.

Yonekura returned for the fourth season despite an earlier intention not to do so. During the break between seasons, Yonekura had starred in the Broadway production of Chicago. The actress and former model gave as her reason for previously declining to appear in the fourth season that she had not had an opportunity to star in the same TV series for an extended run and she never had the confidence to respond to people’s expectations. However, because it was a role she really liked, and she felt able to reprise the role. Traditionally, dramas run for only one season in Japan.

Masao Kusakari stars in the fifth season.

Character Portrayed by Series 1 2 3 SP 4 5 6 7Michiko DaimonRyoko Yonekura colspan="8" Akira KanbaraIttoku Kishibe colspan="8" Hiromi JonouchiYuki Uchida colspan="8" Hideki Kaji colspan="2" Mamoru HaraKosuke Suzuki colspan="6" Hikaru MorimotoKei Tanaka colspan="4" Takashi Torii colspan="4" colspan="2" Ryunosuke Busujima Shiro Ito colspan="2" colspan="5" Shinobu KondoNaohito Fujiki colspan="6" Takashi EbinaKenichi Endo colspan="3" Shigekatsu HirumaToshiyuki Nishida colspan="4" Yoshihito TendoKin'ya Kitaōji colspan="2" colspan="5" Junko ShirakiAtsuko Takahata colspan="2" colspan="4"

Main cast

Ryoko Yonekura as Michiko Daimon (Doctor-X) – A freelance surgeon who takes on the most difficult operations using unorthodox and dangerous methods. Her catchphrase is "I never fail."

Ittoku Kishibe as Akira Kanbara (Melon-Ojisan) – The owner of Kanbara Medical Referral Agency and a former surgeon. Also another Doctor-X who was stripped of his medical License in Cuba. Known for his exorbitant prices and giving melons as gifts, given the nickname of Melon-Ojisan by Hiruma Shigekatsu.

Yuki Uchida as Hiromi Jonouchi – A anaesthetist who originally worked Full-Time in Season One. Resigned in the final episode and joined Kanbara Medical Referral Agency. She is a single mother, her ex husband is also a doctor who appeared in the series.

as Hideki Kaji – One of the surgeons working for the University Hospital. He is known for his expertise in laparoscopy. Dr. Kaji calls Dr. Daimon a demon due to how she doesn't follow status quo. This character is the only one with a spin-off in the series "Doctor-Y".

Kosuke Suzuki as Mamoru Hara – One of three recurring surgeons working for the University. Dr. Daimon calls him "Kin-chan".

Kenichi Endo as Takashi Ebina – One of the surgeons of Tōtei University Hospital, he is portrayed as someone who is weak to authority. He tries to be on Director Hiruma's good side by following his orders.

Toshiyuki Nishida as Shigekatsu Hiruma – One of the main antagonists of the series. In the series, he has been promoted, demoted, holding the position of hospital director or head of surgery. He tries to gain power by controlling top staff, taking advantage of Michiko's assignments, or through corrupt means. He also has tons of mistresses in and outside of the hospital. Secondary Cast

Kei Tanaka as Hikaru Morimoto – Appearances: Seasons 1, 5 and 7 - A surgeon who left at the end of Season One to hone his skills overseas. In the premiere of Season 5, he returned to work in a rural area, but was transferred back to the main hospital by Shimura Madoka. In season 7 he returns briefly in episode 7 to Tōtei but now as a medical "Extuber" helping to provide good publicity.

Shiro Ito as Ryunosuke Busujima – Appearances: Seasons 1, 2 and 3 - The Director of the Hospital in Season One until he was fired due to underhand tactics by Hiruma Shigekatsu. In Season Two, he re-appeared to help Daimon Michiko in fulfilling her wish to operate on a patient. In Season Three, he appeared in the premiere and was rescued from an explosion on a cruise by Daimon.

as Takashi Torii – Appearances: Seasons 1 and 5 - A professor serving as the Director of the Second Surgery Department at Teito III University Hospital in season 1. His hope for becoming the hospital's director was shattered when the former director fell ill and lost influence. In episode 6, he was diagnosed with cancer but concealed his diagnosis to participate in the upcoming academic conference. He fainted on the day of departure and was operated by Daimon in the season finale. He returned in season 5 after his recovery and served as the Deputy Director of the Surgery Department at Totei University Hospital. His personality changed due to his illness, prioritizing his patients over his academic work. He also lost his courage, following all of Hiruma's orders.

Atsuko Takahata as Junko Shiraki – Appearances: Seasons 3 and 7 - The head nurse at the NAMC in season 3. She takes pride in her work and always gives her all. She expects high standards from her nurses and is protective of them. She leads her nurses as an independent faction, shielding them from the center's political struggles. In season 7, she is shown to be working at a nurse themed hostess bar.

Season 3

Kin'ya Kitaōji as Yoshihito Tendo – A former surgeon and current council member of the NAMC. He became the center's new director after Tetsuya Kurobe's dismissal in episode 1. His goal is to establish the Medical Industry Group to foster medical innovation for treating patients. He utilizes Michiko's successful operations to grow his influence to establish the group. He became the group's chairman after its establishment near the end of the season, but was promptly dismissed by the Cabinet of Japan due to political interference. After his dismissal, he realizes his negligence of the patients in front of him and vowes to return as a surgeon.

Season 7 Mansai Nomura as Ryutaro Hachisuka – A former surgeon under Hiruma, now practicing internal medicine. He is the Director of internal medicine & Acting Director of the hospital when season 7 starts. He has a crush on Daimon Michiko, he also got his surgery done by her at the final episode.

Guest appearances

Season one

Mansaku Fuwa as Jiro Ichinose, the president of Ichinose rubber company (Episode 1) Miyako Yamaguchi as Namiko Ichinose, Jiro's wife (Episode 1) Raita Ryū as Shigeru Kubo, Totei University Hospital director (Episode 1) Hirofumi Arai as Satoru Yasuda (Episode 2) Midoriko Kimura as Mitsuyo Yasuda, Satoru's wife (Episode 2) Kazuaki Hankai as Noboru Nikaidō, the president of Nikaidō Publishing company (Episode 2) Kami Hiraiwa as Mitsue Hanayama, a food blogger (Episode 3) Shinsō Nakamaru as Tadashi Honda, Mitsue's lawyer (Episode 3) Shingo Tsurumi as Atsushi Yotsuya, a foreign fund manager (Episode 4) Tamao Akae as Mariko Yoshinaga, The Super Doctors program's host (Episode 4) Akari Ninomiya as Saki Gokita (Episode 5) Naomasa Musaka as Motohiko Rokusaka (Episode 6) Kayoko Kishimoto as Nanako Torii, Takashi Torii's wife (Episode 7–8) Koji Yamamoto as Takuya Hijikata (Episode 7–8) Kanji Tsuda as Ryo Yagi, a gossip magazine black journalist (Episode 8)

Season two

Minori Terada as Kin'ya Ninomiya, the president of Ninomiya Real Estate company (Episode 2) Mirai Yamamoto as Torako Mimura (Episode 3) Mayumi Myosei as Mika Kanie (Episode 3) Yumiko Shaku as Rumiko Shijō, the owner of Nakazono hostess bar in Ginza (Episode 4) Hiroshi Ookochi as Ichirō Gomi (Episode 5) Fuka Koshiba as Kaori Gomi, Ichiro's daughter (Episode 5) Tetsuya Bessho as Mitsuhiko Kusakabe (Episode 5) Shigeru Izumiya as Rokusuke Kondo, Shinobu's father (Episode 6) Yumi Shirakawa as Hisae Asai, a Health Policy Bureau of Ministry of Health, Labour and Welfare (Episode 7) Miyu Honda as Kurumi Murata (Episode 8–9) Kaoru Okunuki as Mitsuyo Murata, Kurumi's mother (Episode 8–9)