Command & Conquer: Red Alert 2: Yuri's Revenge is the expansion pack to Command and Conquer: Red Alert 2. The plot revolves around Yuri, formerly the shadowy Soviet advisor to Alexander Romanov, and his plans for world domination. This is the first Command & Conquer title to have a playable third faction, Yuri's Army, and the first Command & Conquer expansion pack to have a separate executable. The game requires an existing installation of Red Alert 2, patched to version 1.006, to play.