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)

Sean Sollé as London Citizen