Monty Python stars Michael Palin and Terry Jones attended the BFI film festival in support of their late friend Graham Chapman's film.
A Liar's Autobiography - The Untrue Story of Monty Python's Graham Chapman is based on the book Graham wrote, and brings Monty Python stars Michael, Terry, John Cleese and Michael Gilliam together for the first time in 23 years.
Graham died in 1989 aged 48. The film tells the story of his life, including forming Monty Python's Flying Circus at Cambridge University. It also documents his battle with alcoholism and his experience as one of the first actors to publicly come out as gay.
Michael, 69, said: "It's extraordinary that he recorded this soundtrack, he just read the book, and he played his own character, very well. I didn't know this existed, and it gave it this great feeling of Graham being still there.
"I think the great thing was, by doing it in animation makes it something very much richer, and slightly weirder and more surreal, which is very true to Graham's character I think."
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