Stephen Mangan as Postman Pat (voice)

Jim Broadbent as CEO (voice)

Rupert Grint as Josh (voice)

David Tennant as Wilf (voice)

Ronan Keating as Postman Pat (singing voice)

Susan Duerden as Sara Clifton (voice)

Sandra Teles as Julian Clifton (voice)

T.J. Ramini as Ben Taylor (voice)

Peter Woodward as Carbunkle (voice)

Robin Atkin Downes as Simon Cowbell (voice)

Brian George as Ajay Bains (voice)

Parminder Nagra as Nisha Bains (voice)

Jo Wyatt as Meera Brains (voice)

Enn Reitel as PC Selby / Reverend Timms / Pat Wannabe 2 / Raed (voice)

Jane Carr as Mrs. Goggins / Granny (voice)

Dan Hildebrand as Ted Glenn (voice)

Darren Richardson as Alf Thompson / SDS Employee 2 (voice)

Jacob Witkin as George Lancaster / Major Forbes (voice)

Jean Gilpin as Miss Hubbard / Crowd Lady / Pat Wannabe 3 (voice)

Anastasia Griffin as Dr. Sylvia Gilbertson / Lauren Taylor (voice)

Laura Solon as Chat Host (voice)

Olivia Poulet as Dorothy Thompson (voice)

Aimee Osbourne as Amy Wrigglesworth (voice)

Becky Wright as Lizzy Taylor (voice)

Steven Kynman as Bill Thompson (voice)

Teresa Gallagher as Lucy Selby (voice)

Charlie Woodward as Charlie Pringle (voice)

Kieron Elliott as Michael Lam / SDS Employee 1 (voice)

Mike Disa as Jess / UDM 300 (voice)

Chris Evans as Radio Host (voice)

Craig Ferguson as Craig / Not a Dalek (voice)

Robert Anich as Escapologist (voice)

Adam Smyth as Cameraman 1 (voice)

Lucy Davis as Director 1 (voice)

Kelly Beckett as Reporter / SDS Employee 3 (voice)

Julian Stone as Director 2 / Stagehand 2 (voice)

Dee Bradley Baker as Pat Wannabe 1 (voice)

Tony Curran as Paparazzi 2 (voice)

Greg Ellis as Jimmy (voice)

Rachael Louise Miller as Walla Artist (voice)