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Cass was one of the original twenty-five dolphins to come to Pern.
Cass was one of the seventy dolphins that answered the red alert recall sequence that Jim Tillek rang on the big bell at Monaco Bay. The red recall was initiated to request assistance with the evacuation of Landing during the volcanic eruptions. Cass and the other dolphins helped the ships that carried goods from Landing to Kahrain and then made the Second Crossing to Fort Hold in the north.
Appearance, personality and traits
Cass was one of the oldest dolphins, and Jim Tillek considered her one of the most reliable of the females.