Benedict Cumberbatch as Henry Sugar / Max Engelman / Harry (archive footage)

Dev Patel as Dr. Chatterjee / John Winston / Woods (archive footage)

Ben Kingsley as Imdad Khan / The Dealer / Dr. Ganderbai (archive footage)

Richard Ayoade as Dr. Marshall / The Great Yogi / Various (archive footage)

Ralph Fiennes as Roald Dahl / The Policeman / Rat Man (archive footage)

Rupert Friend as Narrator / Claud (archive footage)

Asa Jennings as Peter Watson (archive footage)

Eliel Ford as Stagehand (archive footage)

Truman Hanks as Stagehand (archive footage)

Benoît Herlin as Stagehand (archive footage)

Michael Maggart as Stagehand

Matt Marks as Stagehand

Till Sennhenn as Stagehand (archive footage)

Octavio Tapia as Stagehand (archive footage)