Michael Caine wants to make another 'Batman' film - but only if it focuses more on his character.

The legendary British actor plays dutiful butler Alfred in summer blockbuster 'Batman Begins', opposite Christian Bale who stars as the Caped Crusader, and admits he had a fantastic time shooting the movie.Caine, 72, says he would love to reprise the role for a sequel but is keen for director Christopher Nolan to delve into his character's past.He said: "I made him an ex SAS sergeant.He's wounded. He didn't want to leave the army.And he got found by Bruce Wayne's father who wanted the toughest butler he could find, and that's what he got."That's the back story, now I'm waiting for the director Christopher Nolan to do 'Alfred: The Beginning'".The veteran actor claims he invented Alfred's past, with Nolan's permission, because he didn't have any background to base his role on.

Caine - who has over 100 movie credits to his name - says he based the character on the sergeant he served under while completing his national service in the British Army.

He added: "I used the voice of my original sergeant when I joined the British army It's his voice".