During the "British tv invasion" of the late 1970s, I discovered The Prisoner, The Hitchhiker's Guide to the Galaxy, Upstairs Downstairs, and The Tomorrow People, but I missed The Feathered Serpent (1976-78). It was never broadcast in the U.S., maybe because it's not set in Britain. It's set in a mythic pre-Columbian kingdom that mixes Maya and Aztec (and a little Inca), stage-bound -- no exteriors, but with some nicely decorated sets.
The Emperor Kulkulkhan (Tony Steedman) wants to ensure peace with the neighboring Toltecs by having his daughter, Chimalma (Diane Keen), marry the young Toltec prince Heumac (27-year old Brian Deacon). Meanwhile the evil priest Nasca (Patrick Troughton) tries to sabotage the wedding and generally make trouble, sometimes with supernatural assistance.
Instead, Heumac devotes all of his attention to his young servant, Tozo (19-year old Richard Willis, right). Twice Tozo is captured by the bad guys and tortured, prompting Heumac to attempt a daring rescue. They also go on a perilous quest together. As the series ends, Heumac, Tozo, and Chimalma sit on the royal platform together, as if they will be co-rulers.
Heumac usually wears a sleeveless robe, but during the perilous quest he strips down to another revealing Mayan pouch.
And other characters often display muscular physiques, or at least revealing pouches.