Experiment 1188, otherwise known as Catnap (Real Name: Theodore Grambell), is the third antagonist of Poppy Playtime, serving as the main antagonist of Chapter 3: Deep Sleep.

CatNap’s monstrous form resembles a feline creature cloaked in purple fur. Its eyes showcase black pupils encircled by white irises and a cat-like nose. The creature’s mouth can unhinge widely, devoid of discernible teeth, forming an abyss-like void. Monstrous paws bear four digits, each armed with sharp, black claws, and elongated limbs seem loosely stitched at the joints. The disproportionately small, emaciated torso exposes the rib cage and pelvic bone beneath the skin. Around its neck, a subtle melanoid-black zipper runs, akin to a dull yellow crescent moon charm.

In his hostile form, CatNap takes on a more haunting presence, with a sickly gray complexion. This skeletal version of him portrays a significant increase in his skeletal features. His legs resemble mere bare bones, lacking any semblance of flesh or fur. The paws, in particular, are completely skeletal with elongated bone-like fingers. The most dramatic part of the transformation can be seen in his mouth, which has elongated to an alarming extent, surpassing the length of his torso. His torso, on the other hand, displays an unexpected resemblance to a stegosaurus, with ridges and plates adorning his back. The moon charm that was once a part of CatNap has also undergone a change, now taking on a silver-like appearance.

CatNap's toy form is an anthropomorphic purple-furred cat with black eyes, triangular ears, a black nose and a very long tail. His paws are a darker shade of purple, similarly to the insides of his ears. Just like the other Smiling Critters, CatNap is depicted with a wide, toothless smile with a small gray air tube stuck inside it. His torso possesses a zipper line running down that entire segment of his body, with the zipper sporting a yellow crescent moon pendant.

CatNap’s cartoon appearance is roughly the same as his toy appearance, albeit with his zipper line removed, the addition of white pupils, and the zipper pendant now attached to a black necklace.