Phineas and Ferb Fanfic: Isabella's Secret 4

Isabella has been send to the sky hole. Now, she becomes the Amnemiss (Äm-nee-miss) of Guidance. An Amnemiss is a person who has the symbol of the spiritual animal that represents who you are. Now, she's part spiritual animal that can guide whatever it wants. So then, Eukhanburg has arrived to Earth. Since now, he's going to rule over the planet. It will changed into a scary red darkness. Now, Isabella is gone and can't save the world. Who do you think will save the world? Who are the only survivors in this land?