Ashton Kutcher pulled off a double this week, starring in the top two movies at the US box-office, but audiences appear to prefer Kutcher heard but not seen.

He is in the voice cast of the animated comedy, Open Season, and he co-stars with Kevin Costner in The Guardian, which is not set in a newspaper office but at an academy for elite swimmers. The animated film made over $5 million more than the live-action picture in the US last weekend. Both movies open here next Friday.