Nick Sagan

Narrator

Anthony D. Call

Himself - Author/Self - Author

Alan Dean Foster

David Gerrold

David Gerrold

Sean Carroll

Sean Carroll

Himself - Astrophysicist, Florida Tech/Self - Astrophysicist

Hakeem Oluseyi

Rod Roddenberry

Rod Roddenberry

Himself - Senior Astronomer, SETI Institute/Self - Senior As

Seth Shostak

Paul Davies

Paul Davies

Herself - Microbiologist, Author 'The Highest Frontier'

Joan Slonczewski

Himself - Chemist, UCLA

Ric Kaner

Himself - Neuroscientist, Mechanical Engineer, Northwestern

Malcolm Maciver

Himself - Planetary Scientist

Kevin R. Grazier

Himself - Director, ASU Astrobiology Program

Ariel Anbar

Himself - Distinguished Professor of Marine Chemistry, UCSD

Jeffrey L. Bada

Biologist

Freddie De Grate

Hospital Orderly

Nicole Nasca Supercinski

Fernando

David Villada

Chief Asian Astronomer

Ray Chao

Patient

Gene Richards

Doctor/Patient

Damian Forest Light

John Zacchino

Bivas Biswas

Christian Ortega

Roberta Setzu

Greg Duncan

Tian Wang