The `Gulliver`s Travels` actor - who has sons Sammy, four, and Thomas, two, with wife Tanya Haden -insists he finds it easy to separate himself from his comedy rock group Tenacious D to do things with more universal appeal.

He said: "I feel pretty comfortable in family comedies.

"I am known for my bluer material with Tenacious D, but I can party in the family realm.

"And I have a family now, so I think about that stuff."

Like Jack, his `Gulliver`s Travels` co-star Jason Segal - who is best known for is roles in movies such as `Knocked Up` and `Forgetting Sarah Marshall` - also relished the chance to star in a family movie, though he admits he found it challenging.

Jason said: "It is kind of weird doing a family comedy. It`s been a good challenge, trying to be funny without resorting to swearing and raunchy humour."
sections: Celebrities