• 
  Steve Cell

  Lt. Mueller
• 
  Marianne Muellerleile

  Frau Braunschweig
• 
  Alicia Ziegler

  Nadia
• 
  Cole Jensen

  Gustaf
• 
  Christa Beth Campbell

  Gerti
• 
  Jaeden Lieberher

  Walter
• 
  Gabe White

  Bruno
• 
  Maeve Mansfield

  German Student

• 
  Jessamin Blu

  German Student
• 
  Edward Asner

  Adult Walter (voice)
• 
  London Taylor Klotz

  German Student (as Landon Klotz)
• 
  Connor Finnerty

  German Student
• 
  Finnian Scott Morris

  Johan
• 
  Madeline Convy

  German Student
• 
  Hayley Easterling

  German Student

• 
  Ava Daniels

  German Student
• 
  Avalon Provance

  German Student
• 
  Brendan Provance

  German Student