Connor Paolo
— Louis Slotin
Greg Furman
— Raemer Schreiber
Drew Waters
— Leslie Groves
Coby Larinde
— Marion Edward Cieslicki
Tara Alexandra Brown
— Nurse Anna
Matt Linton
— Theodore Perlman
Manny Spero
— Haroutune Krikor Daghlian Jr.
Sam Jacobs
— Philip Morrison
Henry Hetz
— Samuel Allan Kline
Warren Davis
— Israel Slotin
John Alton
— Alvin C. Graves
Ryan Lucy
— Betty Wilson
Ben Taylor
— Pvt Patrick Joseph Cleary
Braden Nelsen
— Officer
Luke J. Marley
— Soldier
Scott Montefusco
— Soldier