 Shao Khan, the Emperor of the Outworld, has illegally opened the portal between that realm and Earth. If it remains open, on the seventh day, all of mankind shall be destroyed. Now the Lightning God Rayden and four mortals - Liu Kang, Sonya Blade, Princess Kitana and Jax, have 6 days to find a way to close this portal and save the Earth, battling the evil forces of the Outworld as they proceed.