[2] He debuted in 1967 after being selected to portray the protagonist Azuma Hikaru in the television series Kōsoku Esper through 1967 to 1968.
He played a supporting role as ZAT team member Nishida in the Ultraman Taro series.
In NHK's eleventh Taiga drama, Kunitori Monogatari, Mitsugi portrayed Akechi Mitsuharu.
A frequent guest actor,[4] he made six appearances on Ōedo Sōsamō and four on Zenigata Heiji, three on Taiyō ni Hoero!
The producers of Abarenbō Shōgun selected him to reprise his role in the 500th episode special, and again to portray the daimyō Tokugawa Munenao in Series VI.