Taiyou Sentai Sun Vulcan (太陽戦隊サンバルカン, Taiyō Sentai San Barukan), translated as Solar Squadron Sun Vulcan, is Toei's fifth entry to its Super Sentai series. It was broadcast in 1981-82 and is the only sentai to serve as a direct sequel to the one prior, Denshi Sentai Denjiman. It was Toei’s last series with a Marvel copyright, but again with no Marvel involvement in the production.
Sun Vulcan was the smallest Sentai team to date and the only series with a change in team leader. (Wikipedia)