Dominic Sandbrook
Himself - Presenter (4 eps)
Mark Gatiss
Himself - Narrator (voice) (4 eps)
Charlie Jane Anders
Self (4 eps)
Gale Anne Hurd
Self (3 eps)
Douglas Trumbull
Self (3 eps)
Phil Tippett
Self (3 eps)
Neil Gaiman
Self (3 eps)
Michio Kaku
Self (3 eps)
Ronald D. Moore
Self (2 eps)
Arthur C. Clarke
Self (archive footage) (2 eps)
Keir Dullea
Self (2 eps)
Anthony Daniels
Self (2 eps)
Kenny Baker
Self (2 eps)
Edward Neumeier
Self (2 eps)
John Landis
Himself (2 eps)
Adam Rogers
Himself (2 eps)
John Carpenter
Self (2 eps)
William Gibson
Himself (2 eps)
Richard Dreyfuss
Self (2 eps)
Kim Stanley Robinson
Self (2 eps)
Ed Solomon
Himself (2 eps)
Karen Gillan
Herself (2 eps)
David Tennant
Himself (2 eps)
Steven Moffat
Himself (2 eps)
David Webb Peoples
Himself (2 eps)
Janet Peoples
Herself (2 eps)
Rutger Hauer
Himself (2 eps)
Edward James Olmos
Himself (2 eps)
Isaac Asimov
Himself (archive footage) (1 eps)
Paul Verhoeven
Himself (1 eps)
Peter Weller
Himself (1 eps)
Brian Aldiss
Himself (1 eps)
Haley Joel Osment
Himself (1 eps)
Hampton Fancher
Himself (1 eps)
Owen Paterson
Himself (1 eps)
William Shatner
Self (1 eps)
Nathan Fillion
Self (1 eps)
Zoe Saldaña
Self (1 eps)
Nichelle Nichols
Self (1 eps)
Nicholas Meyer
Self (1 eps)
Rick Carter
Self (1 eps)
Veronica Cartwright
Self (1 eps)
Ursula K. Le Guin
Self (1 eps)
Alan Ladd Jr.
Self (1 eps)
Roland Emmerich
Himself (1 eps)
Joe Dante
Himself (1 eps)
Chris Carter
Himself (1 eps)
Carl Sagan
Himself (archive footage) (1 eps)
Peter Coyote
Himself (1 eps)
Christopher Lloyd
Himself (1 eps)
Bob Gale
Himself (1 eps)
Rian Johnson
Himself (1 eps)
Alex Winter
Himself (1 eps)
Syd Mead
Himself (1 eps)
Scott Bakula
Himself (1 eps)
Donald P. Bellisario
Himself (1 eps)
Danny Rubin
Himself (1 eps)
Audrey Niffenegger
Herself (1 eps)