Denzimen are warriors who fight against the Vader Clan, a clan that tries to pollute the Earth with sludge. Denzimen fight using the Super Science of the Denzi people.

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.

Space Investigator Justy arrives on Earth in pursuit of a dangerous bio-weapon, Debora, which has the ability to attach to living things and to control their consciousness and pass on to others through bodily contact. The only way to capture Debora is with a kiss, so Justy commandeers the body of a young man, Masayoshi, and has him kiss any person she suspects of being possessed by Debora.