Every child wonders how Santa delivers Christmas presents all in one night. The 3D, CG-animated “Arthur Christmas,” will answer the secrets of Santa Claus. Sony Pictures Animation announced James McAvoy, Hugh Laurie, Jim Broadbent, Bill Nighy, Imelda Staunton and Ashley Jensen will be part of the voice cast for the animation. Here is the official synopsis: “McAvoy leads the cast as Arthur, the good-natured but clumsy younger son of Santa.