Suggestions by @soda1459

Joaquin Phoenix

as Johnny Cash in World History

Score: +4

Stellan Skarsgård

as Pope John Paul II in World History

Score: +1

Leonardo DiCaprio

as Howard Hughes in World History

Score: +1

Jack Black

as Orson Welles in World History

Score: 0

Jack Gleeson

as Caligula in World History

Score: +7

Morgan Freeman

as God in World History

Score: +2

Alain Chabat

as Perikles in World History

Score: +1

Magnus Bruun

as Leif Erikson in World History

Score: +2

Colin Firth

as Johann Sebastian Bach in World History

Score: +1

Benedict Cumberbatch

as Henry Ford in World History

Score: +1

Jamie Foxx

as Malcolm X in World History

Score: +1

Diego Luna

as Fidel Castro in World History

Score: +2

Benedict Wong

as Confucius in World History

Score: +2

Charles Dance

as Homer in World History

Score: +1

Nicholas Hoult

as Nikola Tesla in World History

Score: +2

Dane DeHaan

as Billy the Kid in World History

Score: -1

Charlie Hunnam

as Jesse James in World History

Score: +2

Jonathan Pryce

as Isaac Newton in World History

Score: +3

Rosamund Pike

as Amelia Earhart in World History

Score: +1

Eddie Redmayne

as Frederick Abberline in Assassin's Creed

Score: +1