Danny says 'think, Isabella! we need some way to undo the brainwashing on amity park, your husband and your daughters!' Isabella realizes 'I got it! a long time ago phineas wrote a certain song that might be catchy enough to counter the mind control but We have to sing it together. here are the lyrics. So you have time to memorize them we'll launch our attack tomorrow at noon.' the final battle and ending are in part 3.