You are Stewie.

Wanting to accelerate your plans of offing your mother and crushing Europe under a tyrannical bootie, you turn to the mad science of self-cloning.

But you were too successful! Your clone, Stewie 2.0, hates your family even more than you do and steals them away to a secret base hidden deep within "siburbia"!

Liberate your family by infiltrating "siburbia" and combating your clone's evil army with your own mechanical horde.

Victory shall be yours!