Lenopans, usually referred to as Sludgepuppies or Sludges, are a species of alien blob shapeshifters. Though now at peace with humanity, they have historically tried to cause trouble on Earth and had thus been in opposition with the Plumbers.


Lenopans are capable of taking on humanoid shapes and features, such as skin and hair, or, in Lucy and Camille's case, a humanoid shape while retaining a mud-like appearance.

Female Lenopans have two mobile whiskers on their cheeks and two antennae above their much larger eyes, while males lack both. Male Lenopans usually have smaller eyes than females.