Lee Ingleby as Bob (UK) (voice)

Joanne Froggatt as Wendy (UK & US) (voice)

Brian Cox as Conrad (UK & US) / Crunch (UK & US) (voice)

Dustin Demri-Burns as Tread (UK) / Thud (UK) (voice)

Blake Harrison as Scoop (UK & US) (voice)

Steven Kynman as Lofty (UK) (voice)

Iain Lauchlan as Chef Tattie (UK & US) (voice)

Nick Mercer as Mr. Bentley (UK) (voice)

Ben Miles as Ace (UK) (voice)

Lucy Montgomery as Mayor Madison (UK) (voice)

Terry Mynott as Tiny (UK) / Two-Tonne (UK) (voice)

Paul Panting as Muck (UK) (voice)

Jacob Scipio as Leo (UK) (voice)

Sam Swann as Stretch (UK) (voice)

Colin Murdock as Bob (US) (voice)

Daniel Bacon as Leo (US) (voice) (as Dan Bacon)

Richard Ian Cox as Lofty (US) (voice) (as Richard Cox)

Vincent Tong as Muck (US) (voice)

Ian James Corlett as Mr. Bentley (US) (voice) (as Ian Corlett)

Nicole Oliver as Mayor Madison (US) (voice)

Lee Tockar as Tiny (US) (voice)

Richard Newman as Two-Tonne (US) (voice)

Peter New as Stretch (US) (voice)

Brian Drummond as Ace (US) (voice)

Brian Dobson as Thud (US) (voice)

Ryan Beil as Tread (US) (voice)