• 
  Neal McDonough

  Maximilian Kolbe
• 
  Ashley Greene

  Rachel (voce)
• 
  Hector Elizondo

  Gunter (voice)
• 
  Piotr Adamczyk

  Maximilian Kolbe
• 
  Richard Epcar

  Additional Voices (voice)
• 
  Erin Fitzgerald

  Additional Voices (voice)
• 
  John Gegenhuber

  Fritsch (voice)
• 
  Susan Isaacs

  Social Worker (voice)

• 
  Justin Shenkarow

  Keith (voice)
• 
  Kirk Thornton

  Julius Kolbe (voice)
• 
  David Henrie

  D.J.
• 
  Weronika Rosati

  Mrs. Karpinski (voice)
• 
  Bridger Zadina

  Francis Kolbe (voice)
• 
  Steele Gagnon

  Januz (voice)
• 
  Davis Desmond

  Additional Voices (voice)

• 
  Gunnar Sizemore

  Raymond (voice)
• 
  Joshua Carlon

  Teen Gunter
• 
  Madison Carlon

  Additional Voices (voice)
• 
  Cullen McCarthy

  Bogdan (voice)
• 
  Phil Biedron

  Teenage Gunter (voice)
• 
  Reba Buhr

  VIrgin Mary (voice)
• 
  Josh Jefferies

  Fritsch (voice)
• 
  Ezra Weisz

  Additional Voices (voice)
• 
  Lisa Ann Grant

  Helen