Main Characters
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Recurring Guest Characters
Narrator
131 guest appearances
Narrator
22 guest appearances
Host
14 guest appearances
Narrator
8 guest appearances
Narrator
7 guest appearances
Host/Biologist
4 guest appearances
Narrator
2 guest appearances
Narrator
2 guest appearances
Narrator
2 guest appearances
Correspondent
2 guest appearances
Narrator
2 guest appearances
Host/Neuroscientist
2 guest appearances
Reporter
2 guest appearances
Venetia Burney
1 guest appearances
Astrophysicist
1 guest appearances
Presenter
1 guest appearances
Narrator
1 guest appearances
Narrator
1 guest appearances
Narrator
1 guest appearances