"All Men Are Brothers" is the sequel to "Water Margin" a.k.a. "Seven Blows of the Dragon" from 1972. At the beginning of "All Men Are Brothers", we learn that the emperor forgives the 108 Liangshan rebels since he finds they have the same enemies.
While serving time for insanity at a state mental hospital, implacable rabble-rouser, Randle Patrick McMurphy inspires his fellow patients to rebel against the authoritarian rule of head nurse, Mildred Ratched.
There is a war in the world between the men and the women. A young girl tries to escape this reality and comes to a hidden place where a strange unicorn lives with a family: Sister, Brother, many children and an old woman that never leaves her bed but stays in contact with the world through her radio.
A musician witnesses the murder of a famous psychic, and then teams up with a fiesty reporter to find the killer while evading attempts on their lives by the unseen killer bent on keeping a dark secret buried.
Take a cliched Horror-story beginning, a remote Gothic mansion, an insane hostess, a group of strangers (four men, three women and a gorilla) and you pretty much begin to see that this is not meant to be a serious film, but rather a parody of several other (older and better) ones.