Supreme Commander: Forged Alliance is a standalone real-time strategy computer game expansion to Supreme Commander, and was released in November 2007, developed by Gas Powered Games and published by THQ, and the second title in the franchise. Because it is a standalone expansion, it is possible to play without owning Supreme Commander, although without a valid CD Key for Supreme Commander online play is limited to the new faction, the Seraphim. Forged Alliance adds new gameplay features to the game, several new units for the three preexisting factions, and is further optimized for increased performance, in response to issues with the original.