Frank Booth is a fictional character from the 1986 film Blue Velvet, directed by David Lynch. He is portrayed by actor Dennis Hopper and is known for his erratic behavior and violent tendencies. Frank is a drug dealer and a sadistic criminal who becomes involved with the film's protagonist, Jeffrey Beaumont, played by Kyle MacLachlan. In the film, Frank Booth is characterized by his unpredictable nature and obsession with control. He often uses a gas mask and exhibits a disturbing fascination with pain and pleasure. His character serves as a representation of the darker aspects of human nature and the hidden underbelly of suburban life.