Here's the breakdown:
* Al Pacino played Colonel John Henry Patterson, the real-life engineer tasked with building a railway in Kenya.
* Val Kilmer played the role of Patterson's friend and colleague, Charles Remington.
* Robert De Niro portrayed the role of the lion, "Ghost", through the use of motion capture technology.
* Gabriel Byrne was cast as the other lion, "Darkness".
* Liz Hurley played the role of a love interest, "Elsa".
While Liz Hurley's role was relatively small, the film featured a star-studded cast, including the four actors you mentioned.