Matthew McConaughey

Narrator (voice)

Kip Thorne

Self

Christopher Nolan

Self

Jonathan Nolan

Self

Emma Thomas

Self

Natalie Batalha

Self

Sean Carroll

Self

Albert Einstein

Self (archive footage)

Paul J. Franklin

Self

Andrea Ghez

Self

Marsha Ivins

Self

Elon Musk

Self

Gail Willumsen