In the series, "Wallace will take a light hearted and humorous look at the real-life inventors, contraptions, gadgets and inventions, with the silent help of Gromit. The series aims to inspire a whole new generation of innovative minds by showing them real, but mind-boggling, machines and inventions from around the world that have influenced his illustrious inventing career" (the BBC press statement). Peter Sallis reprised his role as the voice of Wallace. The filmed inserts are mostly narrated by Ashley Jensen, with one in each episode presented in-vision by Jem Stansfield. John Sparkes also voices a portion in the unseen character of archivist Goronwy.

Peter Sallis
Wallace (voice)

Ashley Jensen
Self - Narrator

John Sparkes
Goronwy (voice)
Jem Stansfield
Self - Science Correspondent

Barack Obama
Self (archive footage) (uncredited)
Wallace introduces correspondents, inventors and experts who explain various real-life contraptions, inventions and scientific accomplishments.
Good Eats87%
An Idiot Abroad77%
Travel Man: 48 Hours in...63%
Brainiac: Science Abuse67%
The Dinosaurs79%
Planet Dinosaur79%
Zoboomafoo67%
Pretend It's a City74%
Monty Python: Almost the Truth (The Lawyer's Cut)76%
Round the Twist70%
Headspace Guide to Meditation78%
SpongeBob DocuPants83%
Expedition: Back To The Future70%
The Moaning of Life76%
Conan O'Brien Must Go80%