Ben Whishaw
— British Boy (voice)
Jena Malone
— American Girl (voice)
Julia Hummer
— German Girl (voice)
Ben Rosenfield
— Tommie Scheel
Jessie T. Usher
— American Boy (voice)
Leah Hennessey
— Brenda Dean Paul
Malik Peters
— Warren Wall
Ivy Blackshire
— Melita Machmann
Daniela Leder
— Melita Machmann (voice)
Alden Ehrenreich
— 1940s Teenager