Mermaid 2 (Guests of King Neptune)
From Tardis Wiki, the free Doctor Who reference
A Mermaid servant served a platter of oysters to the Doctor and his grandchildren, John and Gillian Who when they arrived in King Neptune after fleeing from an active volcano. The mermaid then gave John a golden shell when he, Gillian, and the Doctor left. (PROSE: Guests of King Neptune)
