Doctor Light is a superhero appearing in comic books published by DC Comics. Kimiyo Hoshi is a distinct character from the villain of the same name. She has, however, crossed paths with the villainous Doctor Light on several occasions. Doctor Light appeared in the sixth season of the television series The Flash, portrayed by Emmie Nagata. Publication history Doctor Light first appeared in Crisis on Infinite Earths #4 and was created by Marv Wolfman and George Pérez. Fictional character biography Kimiyo Tazu Hoshi, a brilliant but overly-driven scientist, was the supervising astronomer at an observatory in Japan, overseeing a group of astronomers charting the unnatural effects of the Crisis on Infinite Earths. She is also a medical doctor, as shown in Justice League Annual #3 (1989) and Justice League America #55 (October 1991). As the Crisis continued, Hoshi's fascination with the phenomenon grew into an obsession while the men grew concerned for their safety. Disgusted by their mounting fear, Hoshi arrogantly insulted them and ordered an evacuation, leaving her to study the Crisis alone through her telescope. Meanwhile, the Monitor, a being linked with all positive matter, senses his enemy, the Anti-Monitor, absorbing yet another positive-matter Earth with his antimatter cloud. To tip the scales for the heroes of the positive universe, the Monitor activates one last warrior. He sends a devastating beam of energy from the star Vega to Earth, which strikes the observing Hoshi, leaving massive destruction in its wake. Granted the power of photonics and the name Doctor Light, Hoshi is assigned by the Monitor to guard one of the vibrational forks needed to save the Earth. Teen Titans member Starfire and Outsiders member Halo set out to destroy the machine. Since Doctor Light can't speak to them in English, she resorts to blasting them away from the machine. Superman is the first to communicate with her, given his knowledge of most of Earth's languages. Once the Earth's heroes and villains are brought aboard the Monitor's satellite, the Japanese-speaking Katana takes over as Kimiyo's translator. Doctor Light, granted the ability to understand English, accompanies several heroes to the anti-matter universe to confront the Anti-Monitor. She and Superman soon discover the machines that the villain has deployed to destroy the remaining Earths. The Anti-Monitor ambushes the Man of Steel; Doctor Light defends Superman as best she can. Supergirl arrives, and sacrifices her life, allowing Doctor Light to carry