纳奥比·汤普森

Niobe Thompson

饰：Himself - Host

Jennifer Gardy

饰：Herself

大卫·铃木

David Suzuki

饰：自己

Lister Sinclair

Lister Sinclair

饰：自己

莉迪亚·凯恩

Lydia Cain

饰：animator

Donald Crowdis

饰：自己

斯蒂夫·博加尔特

Stephen Bogaert

饰：自己

妮基·瓜达尼

Nicky Guadagni

饰：Narrator,4 episodes, 2003-2005,

伯林·施韦尔特

Berynn Schwerdt

饰：1 episode, 2005

Brett Schaenfield

饰：Narrator,1 episode, 2021,

Christopher Hume

饰：Self - Host,1 episode, 2009,

Mark Lehner

饰：Self, archaeologist,1 episode, 2017,

Alfons Kennis

饰：Self,1 episode, 2021,

萨利玛·伊克拉姆

Salima Ikram

饰：Self, Egyptologist,1 episode, 2017,

Richard L. Jaeschke

饰：Self, conservator,1 episode, 2017,

Adel Kelany

饰：Self, archaeologist,1 episode, 2017,

Hugh Webster

Hugh Webster

饰：1 episode, 1962

艾萨克·阿西莫夫

Isaac Asimov

饰：Self,1 episode, 1969,

安-玛丽·麦克唐纳

饰：Narrator,1 episode, 1999,

Daniel Levitin

饰：Self,1 episode, 2008,

Clifford Nass

饰：Self,1 episode, 2009,

David Brabham

饰：Self,1 episode, 2009,

保罗·埃利希

Paul Ehrlich

饰：Self,1 episode, 2010,

Stan Gehrt

饰：Self,1 episode, 2011,

Trevor Kristjanson

饰：Self,1 episode, 2012,

Frans de Waal

饰：Self,1 episode, 2012, / ...

James Hare

饰：Self,1 episode, 2012, / ...

David Charbonneau

饰：Self - Harvard University,1 episode, 2012,

Victoria Meadows

饰：Self,1 episode, 2012, / ...

肖恩·本森

Shaun Benson

饰：Ken Brugger,1 episode, 2014,

索菲亚·斯尼加

Sofía Sisniega

饰：Chloe,1 episode, 2014,

Jeffrey McRae

饰：Dean Boen,1 episode, 2014,

尼尔·阿弗莱克

Neil Affleck

饰：Francis Crozier,1 episode, 2015,

Bryce Sage

饰：Self,1 episode, 2015,

Amy Fultz

饰：Self - Co-founder and behaviourist, Chimp Haven,1 episode, 2015,

Huw Lewis-Jones

饰：Self - Historian, London,1 episode, 2015,

Jay Famiglietti

Jay Famiglietti

饰：Self,1 episode, 2016,

Samy Inayeh

饰：Self,1 episode, 2017,

Jeff Turner

饰：Narrator,1 episode, 2017, / ...

Neil Rettig

饰：Self - Cinematographer,1 episode, 2017,

Lillian Glass

饰：Self,1 episode, 2017,

Steve Perlman

饰：Self (University of Victoria),1 episode, 2017,

Mishka Balilty

饰：1 episode, 2018

Gregory Erickson

饰：Self (paleontologist),1 episode, 2018,

约翰·巴肯

John Buchan

饰：1 episode, 2019

Dale Hildebrand

Dale Hildebrand

饰：1 episode, 2019

Hugo Kitching

饰：Narrated by,1 episode, 2019,

Beau Lotto

饰：Self - Neuroscience,1 episode, 2019,

Sophie Scott

饰：1 episode, 2019

Jeffrey Gettleman

饰：Self - South Asian Bureau Chief of New York Times,1 episode, 2019,

Mike Habib

饰：Self - Palaeontologist at University of Southern California,1 episode, 2020,

马克·卡文

Mark Caven

饰：Narrator 2005,1 episode,

Sarika Suzuki

饰：Narrator,4 episodes, 2014-2020,

珍·古道尔

Jane Goodall

饰：Self,2 episodes, 2015-2019, / ...

Erna Buffie

饰：Narrator,1 episode, 2012,

吴珊卓

Sandra Oh

饰：Narrated by,1 episode, 2019,

Anthony Phelan

Anthony Phelan

饰：Narrator,1 episode, 2005,

Andrew Nisker

饰：Narrator,1 episode, 2017, / ...

Adrie Kennis

饰：Self,1 episode, 2021,

Mohamed Abd El-Maguid

饰：Self, maritime archeologist,1 episode, 2017,

Suzanne Simard

饰：Self - professor, The University of British Columbia,1 episode, 2012,

Paul Kligman

Paul Kligman

饰：1 episode, 1962

彼得·辛格

Peter Singer

饰：Self,1 episode, 1992,

Ken Dresen

Ken Dresen

饰：Alexander Fleming,1 episode, 2009,

Larry Beasley

饰：Self,1 episode, 2009,

Bruce Kaufman

饰：Self,1 episode, 2009,

Sara Seager

饰：Massachusetts Institute of Technology,1 episode, 2012, / ...

Geoff Marcy

饰：Self,1 episode, 2012, / ...

Jill Tarter

饰：Self - The SETI Insitute,1 episode, 2012,

Jaymie Matthews

饰：Self - University of British Columbia,1 episode, 2012,

斯黛芬尼·西格曼

Stephanie Sigman

饰：Catalina Aguado,1 episode, 2014,

高登·平森特

Gordon Pinsent

饰：Dr. Fred Urquhart,1 episode, 2014,

Andrew Atherton

饰：Self,1 episode, 2014,

Leora Eisen

饰：Self,1 episode, 2014,

Neil Bennett

饰：James Fitzjames,1 episode, 2015,

Ellen Stofan

Ellen Stofan

饰：Self - Chief Scientist at NASA,1 episode, 2016,

Lauren Stover

饰：Self,1 episode, 2017,

埃米·卡迪

Amy Cuddy

饰：Self,1 episode, 2017,

Anthony Guidotti

饰：Self (Royal Ontario Museum),1 episode, 2017,

Lawrence Witmer

饰：Self,1 episode, 2018,

Julia Clarke

饰：Self,1 episode, 2018,

安德鲁·塔伯特

Andrew Tarbet

饰：1 episode, 2019

David York

David York

饰：1 episode, 2019

Birute Galdikas

饰：Self,1 episode, 2019,

Leanne Allison

饰：Self - Canmore Resident,1 episode, 2019,

Geoff D'Eon

饰：Self - Narrator,1 episode, 2019,

Tara Stoinski

饰：Self - Dian Fossey Gorilla Fund International,1 episode, 2019,

Anne Russon

饰：Self - Phd at York University, Toronto,1 episode, 2019,

Gordon Burghardt

饰：Self - Reptile Researcher,1 episode, 2019,

Greg Asner

饰：Self - Center for Global Discovery and Conservation Science at Arizona State University,1 episode, 2020,

Madeleine van Oppen

饰：Self - Australian Institute of Marine Science at The University of Melbourne,1 episode, 2020,

瑞安·雷诺兹

Ryan Reynolds

饰：Self - Narrator,1 episode, 2022,

大卫·爱登堡

David Attenborough

饰：Self,1 episode,