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Shared credits
Ian McKellen averages 6.71, Patrick Marber averages 6.65. Apart that suggests 6.68; together they average 6.05, a lift of −0.63.
Lift is the average of their films together minus the mean of their two career averages.
Dot size shows IMDb votes; lines are rolling five-film averages. Films with fewer than 1,000 votes are left out.
| Asylum | 2005 | 6.1 | 5,823 | as Dr. Peter Cleave | Writer |
| The Critic | 2023 | 6.0 | 6,785 | as Jimmy Erskine | Writer |