Peter Sellers and Terry-Thomas made 4 films together, and the 3 rated ones average 6.60, 0.22 above their career marks. The best is The Naked Truth at 6.8.

Peter Sellers averages 6.42, Terry-Thomas averages 6.34. Apart that suggests 6.38; together they average 6.60, a lift of +0.22.

Lift is the average of their films together minus the mean of their two career averages.