Details about the "Extinction" game mode for Call of Duty: Ghosts began to leak over the weekend. Today, Activision and Infinity Ward have released the first trailer for this cooperative base defense mode.

Call of Duty: Ghosts introduces Extinction - an all-new 1-4 player cooperative game mode featuring a unique blend of fast-paced survival action, FPS base defense, scavenging and class leveling.

That actually looks like it might be fun.