Yin! Yang! You!.It's Lina's birthday, and Yin and Yang each want to celebrate her birthday without the other one around. When Carl finds that Lina has the power to make Yin and Yang fight each other, he sends her to Earth. She lands in Jason Earles' yard and becomes his dog. Carl sends Yin and Yang to Earth to trap them there, but Yin sends Carl there too. Yin and Yang land in England and try to get to Lina in Hollywood, and Carl lands in a restaurant where he makes everyone flee. Then thousands of Earth cockroaches come and make him their leader to rule the Earth and cause the Dark Tomorrow. Trouble comes when Yin and Yang start to turn into Earth rabbits, Lina into an Earth dog, and Carl into an Earth cockroach. Yin and Yang have to rescue Lina, defeat Carl, and make it back to their own dimension. Meanwhile Mitchel Musso is not invited to Jason Earle's birthday bash so Mitchel Musso and Jason Earles become rivals over their hairstyle and battle, after Carl is defeated Mitchel and Jason become friends.