Fantastic Four #4
Alicia has returned from a sculpture convention to discover the Fantastic Four have a new pet - an adorable new dog that everyone tells her she'll love. But when she first touches the creature, it's cold, it's wet, it's slimy and it's wrong - at least until a moment later, when suddenly, she feels the warm and soft fur she's expecting. Alicia is the only one who can see the truth: This is not a dog. This is something very wrong that has insinuated itself inside the Fantastic Four and which is making everyone think it's a dog. And this creature has designs of its own for both Alicia - and the entire planet Earth!