Galatea
From Tardis Wiki, the free Doctor Who reference
Galliteya was the daughter of Amfetriti. One day, Galliteya became trapped in a net, She was captured, along with her mother, by De Requin. De Requin kept her in a tank, concealed behind a wall.
After Amfetriti's death Peri rescued Galliteya. She was collected by her grandfather, Nereus. (BFA: Cryptobiosis)