| Major General
Leslie R. Groves |
BRIAN DONLEVY |
| Colonel Jeff Nixon |
ROBERT WALKER |
| Matt Cochran |
TOM DRAKE |
| Anne Cochran |
BEVERLY TYLER |
| Jean O'Leary |
AUDREY TOTTER |
| Dr. J. Robert
Oppenheimer |
HUME CRONYN |
| Dr. John Wyatt |
HURD HATFIELD |
| Dr. Enrico Fermi |
JOSEPH CALLEIA |
| President Roosevelt |
GODFREY TEARLE |
| Dr. Marre |
VICTOR FRANCEN |
| Dr. Chisholm |
RICHARD HAYDN |
| Dr. Vannevar Bush |
JONATHAN HALE |
| K. T. Keller |
JOHN LITEL |
| General Thomas
F. Farrell |
HENRY O'NEILL |
| Captain William
S. Parsons |
WARNER ANDERSON |
| Colonel Paul Tibbets,
Jr. |
BARRY NELSON |
| President Truman |
ART BAKER |
| Dr. Albert Einstein |
LUDWIG STOSSEL |
| Dr. Harold C.
Urey |
JOHN HAMILTON |
| Dr. James B. Conant |
FRANK FERGUSON |
| Dr. E. .P.. Wigner |
TOM STEVENSON |
| Dr. Leo Szilard |
JOHN GALLAUDET |
| Grace Tully |
NELLA.WALKER |
| Charles G. Ross |
EDWARD EARLE |
| Dr. O. R. Frisch |
MARTIN KOSLECK |
| Dr. Arthur H.
Compton |
MORONI OLSEN |
| Dr. Troyanski |
NORMAN LLOYD |
| Pilot at Tinian |
JIM DAVIS |
| Walter S. Carpenter,
Jr. |
CHARLES TROWBRIDGE |
| Dr. W. H. Zinn |
FRANK WILCOX |
| General Brehon
Somervell |
HENRY HALL |
| Lieut. General
W. D. Styer |
PAUL HARVEY |
| VEY Quaker Scientist
|
LARRY JOHNS |
| Dr. Rand |
ROBERT EMMETT
KEANE |
| Dr. Ernest O.
Lawrence |
JAMES BUSH |
| Clinic Doctor |
TREVOR BARDETTE |
| Colonel John Lansdale |
WILLIAM WRIGHT |
| C. D. Howe |
DAMIAN O'FLYNN |
