Main Characters Ridley Scott 4 main appearances Narrator 4 main appearances Michio Kaku - Theoretical Physicist 4 main appearances
Recurring Guest Characters Paul Verhoeven 2 guest appearances Kim Stanley Robinson 2 guest appearances Roberto Orci 2 guest appearances David Brin 2 guest appearances Sean Carroll 1 guest appearances Gentry Lee 1 guest appearances Jeff Greenwald 1 guest appearances