|First appearance||"Calculon 2.0" (7ACV20)|
- Morbo first alluded to an invasion by his species in "Xmas Story". There is also an animation cel featuring one.
Morbo: We'll be talking with General Extermulo. [General Extermulo nods.] [nervous] who will crush the human race under his boot, [screaming] unless his demands are met immediately!