Black & White - Pet Kerrigan
This map is just like using the creature in "Black & White." That combined with a tower defense style game play. Months were spent working out the AI to a point where it's rather enjoyable to play with her.
Teaching Kerrigan how to help you defend the base is crucial to surviving as long as you can. If she does something wrong, discipline her. If she does good, reward her. Also she won't do anything unless she sees you do it first. Then she will copy you.
If you love Black & White, you'll love this. Check it out.