Baby Piggy's Mermaid Tale is a Muppet Babies storybook featuring Baby Piggy. Nanny tells Baby Piggy, who is taking her bubble bath, that it is time to go to bed. Piggy wants to stay a little longer, but Nanny tells her she'll turn into a fish. Piggy thinks that's silly, but when she closes her eyes, she opens them to find she's a mermaid underwater. Piggy finds three little Yes-Fish and begins to question them, and they say "Yes!" every time.