An epic adventure awaits you!
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I couldn't find anything on the website listing the actors participating in the project. IMDB wasn't any help either. But after some googling, I found a site that posted screencaps of the closing credits HERE. My assumption is Jamie's role is small since he's amongst a very long list of actors under "Additional Voices". However, there are numerous other names you may recognize.
Being a fan of the original films it was probably fun for Jamie to be a part of and perhaps it will lead to more voice work. :)