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Ian McKellen averages 7.30 across 1 rated films as a writer, ahead of Patrick Marber at 6.65.
Dot size shows IMDb votes. Films with fewer than 1,000 votes sit on the baseline.
| Asylum | 2005 | 6.1 | as Dr. Peter Cleave | Writer |
| The Critic | 2023 | 6.0 | as Jimmy Erskine | Writer |