The Billy Elliot actor voices the schoolboy cartoon hero in Steven Spielberg's 3D film The Adventures of Tintin: Secret of the Unicorn, which also stars Daniel Craig and Andy Serkis.
Bell threw himself into the performance, and he can't wait to see the final cut.
He tells Britain's Daily Mirror, ""I knew I'd be forever mad at myself if we'd messed this up. I have the same scepticism, excitement and anxiety as everyone else does. I'm not going to lie.
""I'm a massive fan of Tintin so it's got to be done right or I'm going to be upset.""