- Liev Schreiber - Narrator (voice)
- Jason O'Mara - Narrator (voice)
- Ed Trucco - Narrator (voice)
- Howard McGillin - Narrator (voice)
- F. Murray Abraham - Narrator (voice)
- Romulus Whitaker - Narrator (voice)
- Linda Hunt - Narrator (voice)
- Stockard Channing - Narrator (voice)
- James Naughton - Narrator (voice)
- Lynn Sherr - Narrator (voice)
- Mark Hamill - Narrator (voice)
- Will Patton - Narrator (voice)
- Laura Dern - Narrator (voice)
- John Ritter - Narrator (voice)
- Patricia Clarkson - Narrator (voice)
- Anthony LaPaglia - Narrator (voice)
- Kate Humble - Narrator (voice)
- Edward Herrmann - Narrator (voice)
- Michael Gross - Narrator (voice)
- Christopher Plummer - Narrator (voice)
- Peter Coyote - Narrator (voice)
- Julia Roberts - Host
- Simon King - Narrator (voice)
- Tim Matheson - Narrator (voice)
- Joe Morton - Narrator (voice)
- Timothy Dalton - Host
- Hardy Jones - Host
- Henry Winkler - Narrator (voice)
- Jay O. Sanders - Narrator (voice)
- Daniel Stern - Narrator (voice)
- Allison Argo - Narrator (voice)
- Nora Young - Narrator (voice)
- Colin Stafford-Johnson - Narrator (voice)
- Joe Hutto - Host
- Liam Neeson - Narrator (voice)
- Brian Unger - Narrator
- Meg Ryan - Host
- Toby Leonard Moore - Narrator (voice)
- Kevin Draine - Narrator (voice)
- Richard Thomas - Narrator (voice)
- Kate Winslet - Narrator (voice)
- Hugo Kitching - Narrator (voice)
- Beverly Joubert - Narrator (voice)
- Chris Morgan - Narrator (voice)
- Dereck Joubert - Narrator (voice)
- BD Wong - Narrator (voice)
- Paul Christie - Narrator (voice)
- Laila Robins - Narrator (voice)
- Kevin Kline - Narrator (voice)
- Koko - Self
- Ewan McGregor - Narrator (voice)
- Ewan McGregor - Host
- Martin Sheen - Narrator (voice)
- Alan Ereira - Narrator (voice)
- Uma Thurman - Narrator (voice)
- Thomas Haden Church - Narrator (voice)
- Bill Pullman - Narrator (voice)
- Howard Hall - Narrator (voice)
- Thoren Ferguson - Narrator (voice)
- Olga Merediz - Narrator
- Olga Merediz - Narrator (voice)
- Samuel Gilbert-Davies - Re-enactor
- David Attenborough - Narrator (voice)
- David Attenborough - Host
- Ben Masters - Narrator (voice)
- Paul Giamatti - Narrator (voice)
- John-Christian Bateman - Narrator (voice)
- Nyambi Nyambi - Narrator (voice)
- James Lurie - Narrator (voice)
- Campbell Scott - Narrator (voice)
- Russell Boulter - Narrator (voice)
- Jayce Bartok - Narrator (voice)
- Gordon Buchanan - Host
- Noma Dumezweni - Narrator (voice)
- Martin Dohrn - Narrator (voice)
- Scott Brick - Narrator (voice)
- Anja Taylor - Self - Narrator (voice)
- Ana Gasteyer - Narrator (voice)
- Mark Emery - Narrator (voice)
- Tom Mustill - Narrator (voice)
- Allan Peck - Narrator (voice)
- David Scheel - Host
- JuJu Chang - Host
- Niobe Thompson - Host
- Tom Harges - Narrator (voice)
- Maria Diekmann - Self
- Keith David - Narrator
- Charlie Russell - Self
- Jonathan Kingdon - Self
- Susane Lee - Narrator
- Nancy Lewman - Narrator
- Jane Goodall - Self
- John Downer
- Mike Birkhead
- Martin Dohrn
- Praveen Singh
- Peter Lown
- Mark Jones
- Alan Ereira
- Sean B. Carroll
- David Malakoff
- Bonnie Brennan
- Beth Jones
- David Malakoff
- Ivo Filatsch
- Sarah Peat
- Brian Leith
- Maria Norman
- Nigel Pope
- Jayne Yoon Jung Jun
- Kevin Ferrier
- Jahne Zachary
- Miles Foster-Greenwood
- Jon Berman
- William Goodchild
- Chris Biondo
Donald C. Johanson interpreta a Self en la serie.
Liev Schreiber interpreta a Narrator (voice) en la serie.
Jason O'Mara interpreta a Narrator (voice) en la serie.
Ed Trucco interpreta a Narrator (voice) en la serie.
Howard McGillin interpreta a Narrator (voice) en la serie.
F. Murray Abraham interpreta a Narrator (voice) en la serie.
Romulus Whitaker interpreta a Narrator (voice) en la serie.
Linda Hunt interpreta a Narrator (voice) en la serie.
Stockard Channing interpreta a Narrator (voice) en la serie.
James Naughton interpreta a Narrator (voice) en la serie.
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