Chief Medical Officer. Like Yattaran, he serves as comic relief when he argues with the ship's cook, Miss Masu, over his raids of Masu's kitchen to get his beverage of choice, sake. He has a pet cat called Mi-kun (named Miaou in the French version), which he adopted after the then-kitten's mother, which was injured and apparently dying, brought him to Zero's office, and was later brought with Zero on board the Arcadia. Doctor Zero's cat, Mi-kun also appears in Space Battleship Yamato as Doctor Sado's cat. Mi-kun also makes on-off appearances in several other anime such as Queen Millennia and Galaxy Express 999. Mi-kun is based on Matsumoto's own pet cat, the latest of which is named Mi-kun III. (Source: Wikipedia)
