Suggestions by @ddbauer

Daniel Craig

as Boromir in The Lord of the Rings (animated)

Jeremy Irons

as Saruman the White in The Lord of the Rings (animated)

Kate Beckinsale

as Arwen in The Lord of the Rings (animated)

John DiMaggio

as Gollum in The Lord of the Rings (animated)

Hugh Jackman

as Aragorn in The Lord of the Rings (animated)

Paul Walter Hauser

as Tom Bombadil in The Lord of the Rings (animated)

Idris Elba

as Gimli in The Lord of the Rings (animated)

Matthew Macfadyen

as Lord Elrond in The Lord of the Rings (animated)

Henry Cavill

as Legolas in The Lord of the Rings (animated)

Chris O'Dowd

as Meriadoc Brandybuck in The Lord of the Rings (animated)

Rowan Atkinson

as Bilbo Baggins in The Lord of the Rings (animated)

Bill Nighy

as Gandalf the Gray in The Lord of the Rings (animated)

David Tennant

as Peregrin Took in The Lord of the Rings (animated)

Nick Frost

as Samwise Gamgee in The Lord of the Rings (animated)

Simon Pegg

as Frodo Baggins in The Lord of the Rings (animated)