Suggestions by @larryjg

Jon Hamm

as Reed Richards in Fantastic Four

Score: 0

Christian Bale

as Knight Who Says "Ni!" in Monty Python's Spamalot

Score: +1

Tom Felton

as Concorde in Monty Python's Spamalot

Score: +1

Simon Pegg

as Swamp Castle Guard in Monty Python's Spamalot

Score: +1

Nick Frost

as Lord of Swamp Castle in Monty Python's Spamalot

Score: +1

Dawn French

as Dennis Galahad's Mother in Monty Python's Spamalot

Score: +1

Taika Waititi

as Sir Bedevere in Monty Python's Spamalot

Score: +1

Mathieu Kassovitz

as Taunting French Guard in Monty Python's Spamalot

Score: +1

Adrian Edmondson

as Historian in Monty Python's Spamalot

Score: +1

Ewan McGregor

as King Arthur in Monty Python's Spamalot

Score: +1

David Walliams

as Historian in Monty Python's Spamalot

Score: +1

Craig Ferguson

as Tim the Enchanter in Monty Python's Spamalot

Score: +1

Idris Elba

as The Black Knight in Monty Python's Spamalot

Score: +1

Matt Lucas

as Patsy in Monty Python's Spamalot

Score: +1

Louis Garrel

as Taunting French Guard in Monty Python's Spamalot

Score: +1

Niall Horan

as Sir Robin in Monty Python's Spamalot

Score: +1

Stephen Fry

as God in Monty Python's Spamalot

Score: +1

Emma Thompson

as God in Monty Python's Spamalot

Score: +1

Whoopi Goldberg

as God in Monty Python's Spamalot

Score: +1

Christina Aguilera

as The Lady of the Lake in Monty Python's Spamalot

Score: +1