"Big Daddy Demon" was the true antagonist of the Angel episode, "Expecting".

"Big Daddy Demon" was actually an unnamed Haxil Beast but earned his nickname from Angel.

The demon was worshipped by Wilson Christopher and his friends, who it provided with wealth and power in exchange for Wilson impregnating women on its behalf - when it attempted to use Cordelia and her friends to give birth to an army of its children, Angel and Wesley were able to kill it when Angel threw a container of liquid nitrogen at it, Wesley subsequently shooting the container open, causing the demon to freeze. Cordelia then shattered it by throwing an anchor head at it.