Massimo Ghini as Enrico Mattei

Vittoria Belvedere as Greta Paulas in Mattei

Franco Castellano as Marcello Boldrini

Simone Montedoro as Ottavio

Mirko Petrini as Attilio Fabbri

José María Blanco as Zanmatti

Giacomo Piperno as Alcide De Gasperi

Sydne Rome as Claire Booth Luce

Carlo Cartier as Tranipoggi

Enzo Marino Bellanich as Bagliardi

Giorgio Miniucchi as Baldwin

Anna Favella as Priscilla

Aurora Cancian as Floriana

Claudio Gnomus as Amintore Fanfani

Achille Brugnini as Camilli

Massimo Franceschi as William McHale

Dario Garofalo as Bellini

Gino Cesari as Luigi Longo

Rosario Coppolino as Giorgio La Pira