Shivers (1975) follows a doctor who creates a parasite through unethical experiments that helps humans return to their animal-like instincts.
Ilsa, She Wolf of the SS (1975) follows real life Isla Koch, a member of the Nazi party best known for her lascivious and sadistic behaviors.
Saló (1975) follows four powerful and exceedingly wealthy Italian libertines and subject boys and girls to torture and pain.
Jaws (1975) follows Matt, Martin and Quint as they try to hunt down a killer great white shark that is terrorizing residence of the Town of Amity.
The Rocky Horror Picture Show (1975) follows newly weds, Brad and Janet, who become stranded and stay in a strange and unusual castle.