Five years after jilting his pregnant fiancée on their wedding day, out-of-shape Dennis decides to run a marathon to win her back.
Simon Pegg
Dennis
Thandiwe Newton
Libby
Hank Azaria
Whit
Dylan Moran
Gordon
Harish Patel
Mr. Goshdashtidar
India de Beaufort
Maya Goshdashtidar
Matthew Fenton
Jake
Simon Day
Vincent
Ruth Sheen
Claudine
Nevan Finegan
Mickey
Tyrone Huggins
Grover
Iddo Goldberg
News Reporter
Ameet Chana
Taxi Driver
Chris Hollins
Himself
Denis Lewis
Herself
Sutara Gayle
Nurse
Gabriel Fleary
Drag Queen
Pandora Colin
Claire
Stephen Merchant
Man with Broken Leg
David Walliams
Man in Bakery
Hazel Douglas
Older Woman
Anna Tolputt
Receptionist
Simon Lenagan
Undercover Cop / Dad
David Cann
Marathon Official
T.R. Bowen
Doctor
Margaret John
Libby's Grandmother
Floella Benjamin
Libby's Mum
David Milner
Libby's Dad
Henrietta Clemett
Reception Nurse
Peter Serafinowicz
TV Commentator
Preston Nyman
Boating Boy (uncredited)
Rene Costa
Spectator (uncredited)
Sarah Curtis
Producer
David Schwimmer
Director
Michael Ian Black
Screenplay
Robert Jones
Joseph Infantolino
Executive Producer
Alexa L. Fogel
Michael Parker
Editor
Charlie Knight
Set Costumer
Annie Hardinge
Costume Design
Richard Greatrex
Director of Photography
Sophie Becher
Production Design
Michelle Guish
Casting
Alex Wurman
Original Music Composer
Levan Doran
Stunts
