Andy Serkis foi o ator do CGI para Gollum e também deu a voz.
His work on The Lord of the Rings started a debate on the legitimacy of CGI-assisted acting. Some critics felt Serkis should have been nominated for the Academy Award for Best Supporting Actor, since his voice, body language, and facial expressions were used. There is the argument that his CGI actions were partially, or in some cases fully, animated without his movements, but the same is true for actors in a traditional film with CGI. Serkis does appear briefly as Sméagol before he transforms into Gollum, and the CGI Gollum's facial characteristics are fundamentally based on Serkis' own.
Ele também fez a captura de movimento e algumas das vocalizações de Caesar na série Planet of the Apes .
E todos os Navi em Avatar foram dublados pelos próprios atores; a maioria tem poucas ou nenhumas linhas inglesas.