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Risolva was looking for the Eighth Doctor. He told her about how The Clocksmith came to her world and dismantled her to get the rest of the Solvers to follow him. She heard of the Doctor on her way to find her people again and asked him to help her. When they found her people she got them back on her side and asked them to hide the clock across Europe. (AUDIO: The Doomsday Chronometer)