The Fridge Monster is the alien-like creature that attacks the Bebop's crew in Session #11, "Toys in the Attic".
The Fridge Monster appears as a small, black blob that slides around on the floors, walls and ceilings. It travels very quickly and can alter its shape as it moves. It can incapacitate a living creature by biting it, secreting a toxin, although it is unknown if the bite is fatal or not. The monster itself is a mutated version of a Ganymede Rock Lobster - although what caused its mutation is unknown. The Fridge Monster is apparently edible with no adverse side-effects, as Ed eats the monster at the end of the episode. However, due to Spike previously setting the auto-pilot to land on Mars, she is most likely succumbed to the monster's poison as well.