| 角色 | 演員 | 備註 |
| Himself - Narrator/ ... (23 episodes, 1999-2006) | Jack Fortune |
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| Herself - Narrator/ ... (16 episodes, 1999-2005) | Dilly Barlow |
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| Himself - Narrator/ ... (8 episodes, 2001-2006) | 伯納德·希爾（Bernard Hill） |
|
| Himself - Narrator (7 episodes, 2000-2004) | 約翰·斯拉普內爾（John Shrapnel） |
|
| Himself - Narrator (6 episodes, 2005-2008) | 伊安·霍姆（Ian Holm） |
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| Herself - Narrator/ ... (5 episodes, 2003-2006) | Barbara Flynn |
|
| Himself (5 episodes, 2000-2005) | Bill McGuire |
|
| Herself - Narrator (4 episodes, 1996-1997) | Jo Unwin |
|
| Narrator/ ... (4 episodes, 1972-1995) | Paul Vaughan |
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| Himself - Narrator/ ... (3 episodes, 1994-1998) | Hugh Quarshie |
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| Himself (3 episodes, 1999-2002) | Ken Feder |
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| Himself (3 episodes, 2002-2004) | Michio Kaku |
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| Herself - Narrator (2 episodes, 1996-2002) | 茱麗葉特·斯蒂文森（Juliet Stevenson） |
|
| Himself - Narrator (2 episodes, 1997) | Nigel Le Vaillant |
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| Herself - Narrator (2 episodes, 2000-2002) | Emma Fielding |
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| Himself - Narrator (2 episodes, 2003-2006) | 比爾·帕特森（Bill Paterson） |
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| Himself - Narrator (2 episodes, 2006-2008) | 約翰·漢納（John Hannah） |
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| Himself - Narrator (2 episodes, 2006) | Struan Rodger |
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| Himself - Narrator/ ... (2 episodes, 2002-2004) | Neil Pearson |
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| Narrator (2 episodes, 2008) | 彼得·卡帕爾蒂（Peter Capaldi） |
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| Himself (2 episodes, 2006-2007) | Seth Lloyd |
|
| Himself/ ... (2 episodes, 1986-2003) | Richard Dawkins |
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| Himself (2 episodes, 2000-2004) | Carter Clarke |
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| Himself (2 episodes, 2000-2004) | Boris Feigelson |
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| Himself (2 episodes, 2000-2004) | Alex Grizenko |
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| Himself (2 episodes, 2000-2004) | Tracy Hall |
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| Himself (2 episodes, 2000-2004) | Robert Hazen |
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| Himself (2 episodes, 2000-2004) | Stephen Lussier |
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| Himself (2 episodes, 2000-2004) | Martin Rapaport |
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| Herself (2 episodes, 2000-2004) | Janet Reimer |
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| Himself (2 episodes, 2000-2004) | Herbert Strong |
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| Himself (2 episodes, 2000-2003) | French Anderson |
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| Himself (2 episodes, 2000-2002) | Matthew Carrano |
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| Himself (2 episodes, 2000-2002) | Philip Currie |
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| Himself (2 episodes, 2000-2002) | Michael Rampino |
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| Himself (2 episodes, 2000-2001) | Story Musgrave |
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| Himself (2 episodes, 2000-2001) | Kenneth Nealson |
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| Himself (2 episodes, 2000-2001) | Greg Stock |
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| Himself (2 episodes, 2000) | Lee Silver |
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| Herself (2 episodes, 2001-2003) | Monica Grady |
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| Herself (2 episodes, 2002-2004) | Susan Jebb |
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| Himself (2 episodes, 2002-2004) | Pete Larson |
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| Himself (2 episodes, 2002-2003) | Ian Russell |
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| Himself (2 episodes, 2002-2003) | Iain Stewart |
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| Himself (2 episodes, 2002) | Paul Wignall |
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| Himself (2 episodes, 2003-2004) | Vilayanur Ramachan.. |
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| Himself (2 episodes, 2004-2006) | Raymond Kurzweil |
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| Himself - Narrator/ ... (2 episodes, 2006) | 比爾·奈伊（Bill Nighy） |
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| Himself - Narrator (1 episode, 1999-2003) | Aden Gillett |
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| Herself - Narrator (1 episode, 2003-2005) | 阿曼達·波頓（Amanda Burton） |
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| Himself - Narrator (1 episode, 2004) | 約翰·西姆（John Simm） |
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| Narrator (unknown episodes, 1996) | Veronika Hyks |
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| Narrator (unknown episodes, 1999) | 阿曼達·萊德曼（Amanda Redman） |
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| Narrator (unknown episodes, 2000) | 琳賽·鄧肯（Lindsay Duncan） |
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| Narrator (unknown episodes, 2001) | 史蒂芬·曼甘（Stephen Mangan） |
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| Narrator (unknown episodes, 2001) | Siobhan Redmond |
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| Narrator (unknown episodes, 2002) | 凱西·泰森（Cathy Tyson） |
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