"The Rocky Horror Picture Show" is a 1975 musical comedy horror film by 20th Century Fox, directed by Jim Sharman and co-written by Richard O'Brien and Sharman. The film is a parody tribute to the science fiction and horror 'B movies' of the 1930s through the early 1960s.

In this cult classic, sweethearts Brad (Barry Bostwick) and Janet (Susan Sarandon), stuck with a flat tire during a storm, discover the eerie mansion of Dr. Frank-N-Furter (Tim Curry), a transvestite scientist. As their innocence is lost, Brad and Janet meet a houseful of wild characters, including a rocking biker (Meat Loaf) and a creepy butler (Richard O'Brien). Through elaborate dances and rock songs, Frank-N-Furter unveils his latest creation: a muscular man named "Rocky."

The creepy butler is named Riff Raff, a Transylvanian who came to Earth with his sister Magenta and his master, Frank-N-Furter. He greets Brad and Janet when they enter the castle and acts as a servant to Frank throughout the film. He has an unusually intimate relationship with his sister and a jealousy complex with Frank. Near the end of the film, he becomes the new commander of the castle, taking prisoner of Frank.

Today, the film has a large international cult following and has been considered by many as one of the greatest musical films of all time. It was selected for preservation in the United States National Film Registry by the Library of Congress in 2005.

More Info: en.wikipedia.org