Sean B. Carroll

Executive Producer

Lawrence Krauss

Self

Carl Sagan

Self (archive footage)

John Casani

Self

Carolyn Porco

Self

Timothy Ferris

Self

Edward Stone

Self

Nick Sagan

Self

Larry Soderblom

Self

Charley Kohlhase

Self

Fran Bagenal

Self

James F. Bell

Self

Frank Locatell

Self

Suzanne Dodd

Self

Jon Lomberg

Self

Heidi Hammel

Self

Candy Hansen

Herself

Andrew Ingersoll

Himself

Dave Linick

Himself

Fernando Peralta

Himself

Linda J. Spilker

Herself

Tom Spilker

Himself

Janet Sternberg

Herself

Amahl Drake

Herself

Don Gurnett

Himself

Emer Reynolds

Director

Keith Potter

Executive Producer

Dennis Liu

Executive Producer

John Rubin

Executive Producer