天蠶變 Bastard swordsman

"A put-upon illegitimate son of a 'Martial Arts World' master nearly sacrifices all to learn the 'Silkworm Style'. This will make him a veritable 'Spider-Swordsman'!"
"武當雜役雲飛揚(徐少強)為掌門青松之私生子, 限於門規, 不能相認, 青松只得隱藏身份暗中傳授雲武功. 青松與無敵門主獨孤無敵(萬梓良)十年一戰而敗, 無敵忌憚青松師兄燕沖天的天蠶功, 期以兩年後約青松再戰! 青松收傅玉書(劉永)為徒, 怎知傅為逍遙谷主之孫, 入武當就為報仇及偷學絶藝. 傅使計刺殺青松, 嫁禍雲, 並接任掌門. 雲被追殺, 得無敵女兒鳳(楊菁菁)相救, 帶往見其母沈夫人, 得知鳳是其同父異母之妹, 更得天蠶功抄本! 雲最後練成天蠶功, 清理門戶, 為父報仇, 但仍要面對獨孤無敵..."
"Actor Lu Chun-ku really hit his stride as a director of mystical kung-fu epics, like Holy Flame Of The Martial World, and this -- truly one of the best of its kind. Hsu Shao-chiang stars as a put-upon illegitimate son of a 'Martial Arts World' master, who nearly sacrifices all to learn the 'Silkworm Style' -- making him a veritable 'Spider-Swordsman'! That's just the pay-off to this eye-filling, mind-bending kung-fu phantasmagorical which elicited cries of joyous disbelief in virtually all the cinemas where it was shown. Featuring a top notch cast including 'Venoms' Lo Meng, Sun Chien, and Wang Li, this extravaganza truly warrants the description: 'unforgettable.'."