| Al Pacino | Bobby |
| Kitty Winn | Helen, Bobby's Girlfriend/Mrs. Rogers |
| Alan Vint | Narcotics Detective Hotch |
| Richard Bright | Hank the Burgler/Bobby's Brother |
| Kiel Martin | Chico, Junkie |
| Michael McClanathan | Sonny, Junkie |
| Warren Finnerty | Sammy, Junkie |
| Marcia Jean Kurtz | Marcie |
| Raul Julia | Marco, Junkie Artist |
| Angie Ortega | Irene |
| Larry T. Marshall | Mickey |
| Paul Mace | Whitey |
| Nancy MacKay | Penny |
| Gil Rogers | Robins |
| Joe Santos | Detective DiBono |
| Paul Sorvino | Samuels |
A woman from Indiana becomes addicted to heroin when she falls in love with a larcenous New York City junkie.
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