Cell has come to Nerima and has slaughtered many of Ranma’s friends as they attempted to stop him from killing innocents. Ranma is injured and locked as a female during one of Cell’s attacks. She fights and loses friends and fights some more, unlocking the Nekoken, but still it’s not enough. Nearly dead, Ranma is taken to Roshi’s Island to recover. More fights with Cell leads to Ranma and Vegita spending a year in the Chamber of Time and Space where she grows powerful and in love with him. (Dragon Ball Z Crossover.)