In the 2006 film Casino Royale, James Bond is sent to kill the corrupt MI6 section chief Dryden.
Dryden appears in the film's black-and-white opening sequence, set before Bond has earned his 00 status. He is identified as the head of an MI6 station in Prague and has been selling classified information. Bond confronts him in a bathroom and kills him, completing one of the two kills required for Bond to become a licensed 00 agent. The other target is Dryden's contact, Fisher.
The sequence is important because it establishes the film's version of Bond as a newly promoted, less polished operative. Rather than beginning with an experienced spy, Casino Royale shows the dangerous threshold at which Bond becomes a 00 agent. Dryden's betrayal also gives the opening a personal intelligence-service context before the main story shifts to Le Chiffre and the poker tournament.
A common mix-up is confusing Dryden with M, Bond's superior, or with Le Chiffre, the film's principal villain. Dryden is a brief opening antagonist, not the central enemy.