The Lord Of The Rings: The Two Towers -

: Andy Serkis's performance was originally meant only for voice-over, but his physical audition convinced Jackson to use Motion Capture technology for the entire character. A specialized "sub-surface scattering" software was developed to give his digital skin a realistic translucent glow.

Lord of the Rings: The Two Towers movie review - Roger Ebert The Lord of the Rings: The Two Towers

The production was famously physically demanding for the cast: : Andy Serkis's performance was originally meant only