Taiyo Sentai Sun Vulcan is the fifth season in Toei Company's Super Sentai tokusatsu television series. It was broadcast from February 7, 1981, to January 30, 1982, and is the only Super Sentai series to serve as a direct sequel to its previous series and the only all-male Super Sentai team. Its international English title as listed by Toei is simply Sun Vulcan. This was the last Sentai season to be co-produced with Marvel Comics.

Depicts the bloody siege of the fortress of Port Arthur, one of the most strongly fortified positions in the world, during the Russo-Japanese War of (1904 - 1905). In the story dominated the character Lt Takeshi Kogyo (Teruhiko Aoi), teachers, and a reserve officer who became commander of the platoon and later company. At the same time monitors the conduct of the army commander general Nogi (Tatsuya Nakadai), which was commissioned of the emperor Matsuhito (Toshirô Mifune) to the conquest of the fort.

Retired samurai Kumosuke lives quietly, not to say idly, in Edo (old Tokyo) with his wife and two children, a young boy named Shinnosuke and an infant girl, Ohana. While he nominally runs a courier business to earn a living, he seems to spend most of his time smoking his pipe, drinking sake, and chasing women. The arrival of a Shinsengumi squad led by a young swordswman, Ichimonji Hyougo, disrupts this peaceful routine, forcing Kumosuke to defend himself.