Ocean is the black kitten with a white ear that the narrator plucks from the ground in Lettie’s bizarre parallel universe. She’s named after Lettie’s “ocean,” the mysterious pond behind the Hempstocks’ house. Having lost his beloved kitten, Fluffy, earlier in the story, the narrator adores Ocean and keeps her as a pet for years—though as an adult, he doesn’t remember what became of her or how she died. Decades later, when the middle-aged narrator goes to visit the Hempstocks’ farm, he finds that Ocean—like the elderly Old Mrs. Hempstock—is inexplicably still alive.