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By the time the Ninth Doctor and Rose Tyler met Lady Cassandra O'Brien.Δ17, she was little more than a piece of skin stretched onto a frame with eyes and a mouth, connected to a brain. After that piece of skin ripped apart, (TV: The End of the World) her brain was attached to stretched out skin taken from the back. When she was finally able to leave this body and enter Rose Tyler's, Cassandra said, "Goodbye trampoline, hello blondie." (TV: New Earth)