 | Richard Feynman als Self (archive footage) |
 | Joan Feynman als Self - Sister |
 | Freeman Dyson als Self (archive footage) |
 | Sean Carroll als Self - Theoretical Physicist, CALTECH |
| Leonard Mlodinow als Self - Author of 'Feynman's Rainbow' |
| Carl Feynman als Self - Son |
| Michelle Feynman als Self - Daughter |
| Richard Davies als Self - Physicist and friend |
| Marcus Chown als Self - Author and former Feynman student |
| Jirayr Zorthian als Self - Artist and friend |
| Danny Hillis als Self - Computer designer and friend |
| Albert Hibbs als Self - Mathematician and friend (archive footage) |
| Donald Kutyna als Self - General, US Airforce 1957-1992 |
| Larry Mulloy als Self - NASA (archive footage) |
 | Daniela Nardini als Narrator (voice) |
| Elisa Piccio | Thanks |
| Jane Summers | Production Coordinator |
| Dan Peterson | Sound |
| Piers Wallace | Title Designer |
| Philip Sheppard | Original Music Composer |
| Mark Hedgecoe | Executive Producer |
| Christopher Riley | Producer |
| David Seubert | Thanks |
| Sam Allen | Camera Operator |
| Michael McEachern | Camera Operator |
| Fred Baillod | Online Editor |
| John Osborne | Sound |
| Briony McKnight | Assistant Editor |
| Don Parris | Thanks |
| Shelley Erwin | Thanks |
| Chris Purcell | Camera Operator |
| Andy Brill | Thanks |
| Fraser Davidson | Thanks |
| Charlie Stone | Assistant Editor |
| Fergal McGrath | Editor |
| Rainer Friedrich | Camera Operator |
| Daniel Passes | Assistant Editor |
| Lincoln Terhark | Sound |
| Peter Lynch | Colorist |
| Tony Nixon | Scientific Consultant |
| Piers Wallace | Animation |
| Alan Russell | Sound Re-Recording Mixer |
| Lisa Moultrie | Production Manager |
| Christopher Riley | Director |
| Brian Bell | Thanks |
| Steve Bergson | Archival Footage Research |
| Jefferson Miller | Camera Operator |
| Chris Macdonald | Assistant Editor |
| Anna Ly | Assistant Editor |
| Deborah Williams-Hedges | Thanks |
| Loma Karklins | Thanks |
| Antony Buonomo | Title Designer |
| Antony Buonomo | Animation |
| Robert Lambourne | Scientific Consultant |
