The Main Title Credits   "THE BEGINNING OR THE END" Starring BRIAN DONLEVY • ROBERT WALKER   with TOM DRAKE • BEVERLY TYER AUDREY TOTTER  • HUME CRONYN HURD HATFIELD • JOSEPH CALLEIA GODFREY TEARLE  As President Roosevelt VICTOR FRANCEN • RICAHARD HAYDN   JONATHON HALE  • JOHN LITEL HENRY O"NEILL  • WARNER ANDERSON BARRY NELSON ART BAKER  as President Truman LUDWIG STOSSEL  as Dr Albert Einstein   Screen Play by FRANK WEAD Original Story by ROBERT CONSIDINE   Director of Photography RAY JUNE, A.S.C. Film Editor GEORGE BOEMLER Musical Director DANIELE AMFITHEATROF Recording Director DOUGLAS SHEARER Art Direction CEDRIC GIBBONS HANS PETERS Set Direction EDWIN B. WILLIS Associate KEOGH GLEASON Special Effects WARREN NEWCOMBE A. ARNOLD GILLESPIE Associate DONALD JAHRAUS Montage Effects by PETE WALLBUSCH Costume Supervision IRENE Make-Up Created by JACK DAWN   Scientific Technical Advisors: DR. H.T. WENSEL DR. EDWARD R. TOMPKINS — Oak Ridge, Tennessee DR. DAVID HAWKINS — Los Alamos, New Mexico W. BRADFORD SHANK— Los Alamos, New Mexico     Military Technical Advisors: WILLIAM A. CONSODINE, COL. — Manhattan Project CHARLES W. SWEENEY, Lt. Col. A.C. With Acknowledgements to Mr. TONY OWEN for his Cooperation   Produced by SAMUEL MARX Directed by NORMAN TAUROG