Martin Freeman
as Arthur Dent

Yasiin Bey
as Ford Prefect

Zooey Deschanel
as Trillian

Sam Rockwell
as Zaphod Beeblebrox

Alan Rickman
as Marvin (voice)

Anna Chancellor
as Questular Rontok

Bill Nighy
as Slartibartfast

Richard Griffiths
as Jeltz (voice)

John Malkovich
as Humma Kavula

Helen Mirren
as Deep Thought (voice)

Thomas Lennon
as Eddie the Computer (voice)

Stephen Fry
as Narrator / The Guide (voice)

Warwick Davis
as Marvin

Bill Bailey
as The Whale (voice)

Su Elliot
as Pub Customer

Dominique Jackson
as Fook

Simon Jones
as Ghostly Image

Kelly Macdonald
as Reporter

Ian McNeice
as Kwaltz (voice)

Steve Pemberton
as Mr. Prosser

Albie Woodington
as Barman

Mark Longhurst
as Bulldozer Driver

Jack Stanley
as Lunkwill

Mak Wilson
as Vogon Interpreter (voice)

Mark Gatiss
as Additional Vogon Voices

Reece Shearsmith
as Additional Vogon Voices

Mason Ball
as Creature Performer

Sarah Bennett
as Creature Performer

Danny Blackner
as Creature Performer

Hayley Burroughs
as Creature Performer

Cecily Fay
as Creature Performer

Aron Freeman
as Creature Performer

Ian Kay
as Creature Performer

Nikki Bond
as Creature Performer

Mohsen Nouri
as Creature Performer

Oliver Parham
as Creature Performer

Nigel Plaskitt
as Creature Performer

Lynn Robertson Bruce
as Creature Performer

Jerome St. John Blake
as Vogon Soldier

Milo Bodrozic
as Vogon Soldier

Martin Dawson
as Vogon Soldier

Dan Ellis
as Vogon Soldier

Steve Grindle
as Vogon Soldier

Art Hewitt
as Vogon Soldier

Simon Hibbs
as Vogon Soldier

Rob Horseman
as Vogon Soldier

Mike Lewis
as Vogon Soldier

Paul Nathaniel
as Vogon Soldier

Tim Perrin
as Vogon Soldier

Jessie Riley
as Vogon Soldier

Tucker Stevens
as Vogon Soldier

Ashley Stuart
as Vogon Soldier

Benjamin Uttley
as Vogon Soldier

Patrick Walker
as Vogon Soldier

Spencer Wilding
as Vogon Soldier

William Wollen
as Vogon Soldier

Edgar Wright
as Deep Thought Technician (uncredited)

Jason Schwartzman
as Gag Halfrunt (uncredited)

Mark Rhino Smith
as Pall Bearer (uncredited)