Impulse is a 1990 American neo-noir film directed by Sondra Locke, and starring Theresa Russell, Jeff Fahey, and George Dzundza. It follows a female police officer who works as an undercover prostitute in Los Angeles, who unwittingly finds herself at the center of a murder investigation. The film also features a power ballad by singer Kim Carnes called "Everybody Needs Someone".


LAPD officer Lottie Mason works vice squad as a decoy prostitute. She is faced with various problems in her career, including being sexually harassed by her superior, Lieutenant Joe Morgan. However, she finds her sting operations thrilling, often fantasizing about "losing control." Stan Harris, a detective in the department, begins to romance Lottie. The two eventually go on a date together and become intimate.