Orson Welles character Jonathan Wilk
Diane Varsi character Ruth Evans
Dean Stockwell character Judd Steiner
Bradford Dillman character Arthur A. Straus
E.G. Marshall character District Attorney Harold Horn
Martin Milner character Sid Brooks
Richard Anderson character Max Steiner
Robert F. Simon character Police Lt. Johnson
Robert Burton character Charles Straus
Wilton Graff character Mr. Steiner
Louise Lorimer character Mrs. Straus aka 'Mumsy'
Gavin MacLeod character Padua - Horn's Assistant
Edward Binns character Tom Daly
Colin Kenny character Courtroom Spectator (uncredited)