Casp put the hospital under quarantine and then disappeared. She attempted to flee from the infectious patients by climbing up a lift shaft ladder in pursuit of the Doctor and Cassandra/Rose. She grasped Rose's ankle and berated them for ruining the Sister's work, to which Cassandra responded by telling her to "go and play with a ball of string". However, when a patient grabbed Casp's ankle, spreading its numerous viruses to her immunity-free body, Casp fell from the ladder and plummeted to her death at the bottom of the shaft, screaming all the way down. (TV: New Earth)