'Grindhouse' failure has put 'Sin City 2' in doubt, says Madsen

Actor Michael Madsen has hinted the upcoming sequel to 'Sin City' may never be made, after director Robert Rodriguez's recent film 'Grindhouse' failed to perform as well as expected.

Rodriguez and Quentin Tarantino's 'Grindhouse' double bill was a box-office disappointment in the US, and Madsen is now unsure whether the 'Sin City' follow-up will see the light of day.