Tails saw Cosmo fall out of the sky and she landed a few feet away, knocked out. He knew she needed help. When she woke up she told them the dangers of the Metarex, an evil army of robots who want to destroy the Universe. And now all this time they have been fighting the Metarex, so Cosmo decided to throw a surprise "Thank You" party. Until Victor, Charmy, and Espio came and they needed their ship to be repaired. And I guess, somehow, he found out that Tails was in प्यार with Cosmo, and here comes trouble. Victor had three plans and all of them sank to the bottom, except plan four. Victor kicks the disco ball and it's coming towards Cosmo! Then Tails jumps on चोटी, शीर्ष of her to get her out of the way. Then a good staring moment comes. On the सेकंड to last episode Cosmo sacrificed her life to save the Universe. After the Universe was सुरक्षित her last words were: "Tails, whenever आप need me, just look for me right अगला beside you." Two प्रेमी never grow apart.
~Thank आप