Michael Fassbender
as Brandon "Martian" Colby
Jeffrey Wright
as Henry Ogletree
Richard Gere
as James "Bosko" Bradley
Katherine Waterston
as Naomi
Jodie Turner-Smith
as Samia Zahir
John Magaro
as Owen Taylor
Harriet Sansom Harris
as Dr. Rachel Blake
Saura Lightfoot Leon
as Daniela "Danny" Ruiz Morata
Andrew Brooke
as Grandpa
India Fowler
as Poppy Cunningham
Ambreen Razia
as Blair
Christian Ochoa
as Grandma
Reza Brojerdi
as Professor Reza Mortazevi
Alex Reznik
as Coyote