In a studio setting, Stephen Hawking, Arthur C. Clarke and Carl Sagan (who joins them via satellite) discuss the Big Bang theory, God, our existence as well as the possibility of extraterrestrial life.
| Name | Type | Role | |
|---|---|---|---|
| Arthur C. Clarke | Guest Star | ||
| Stephen Hawking | Guest Star | ||
| Magnus Magnusson | Guest Star | ||
| Carl Sagan | Guest Star | ||
| Hector Stewart | Director |