• 
  Matthew Broderick

  regizor

• 
  Ralph Leighton

  scenarist

• 
  Matthew Broderick

  Richard Feynman
• 
  Jeffrey Force

  Tanarul Richard
• 
  Peter Riegert

  Mel Feynman
• 
  Patricia Arquette

  Arline Greenbaum
• 
  David Barrera

  Chepa
• 
  James Le Gros

  John Wheeler

• 
  Damion Scheller

  Calculator Kid #2
• 
  James Hong

  Abacus Adder
• 
  Matt Mulhern

  Gate Guard
• 
  Joshua Goldin

  Passenger #3
• 
  Joshua Malina

  Calculator Kid #3
• 
  Kirk Fox

  Mechanic
• 
  Peter Michael Goetz

  Dr. Gell-Mann

• 
  Demetrius Navarro

  Calculator Kid #4
• 
  Geoffrey Nauffts

  Rob
• 
  Joyce Van Patten

  Aunt Ruth
• 
  Mary Pat Gleason

  County Nurse #2
• 
  Marianne Muellerleile

  Nurse Gracie
• 
  Josh Keaton

  David
• 
  Googy Gress

  Passenger #2
• 
  Zeljko Ivanek

  Bill Price
• 
  Tom Kurlander

  Şofer
• 
  Kelly Wolf

  Nurse Kate
• 
  Kristin Dattilo

  Joan Feynman
• 
  David Drew Gallagher

  Harold