Goop

Goop (Aka: Pog or Goopy Goop) is a puddle of green slime, it has two eyes and a mouth, it seems to be falling upwards

Method of killing
Going inside its victim through their mouth and then cutting their organs from their insides

Containment Procedures
Standard cell, it is to be given a dead rat every day, Sara is not allowed to free Goop or Gooplings and then say "You eat those animals and give them to your specimens, let them eat humans, humans are a better source of food" as an excuse, you eat food you dumb cupcake, why can't we eat food and you can eat food?

Trivia
Goop is based on Specimen 2

Goop isn't falling upwards but instead it is on an upside down reality, this can be seen by its shadow being created on top of itself

Peter jokingly named Goop "Goopy Goop" but he almost never uses that name...

Goop's alt name is "Pog" because it is goop backwards