Plague of Babies / Bloaty's Pizza Hog

S1, E10: Zim catches Noogums, the baby from next door, looking at him and is convinced the drooling menace is a spy. But for once, Zim's suspicions prove to be more than paranoid delusions. It turns out that Noogums, as well as others babies, are actually adult aliens who, stuck on Earth, pose as human infants. / It's that time of year again: Membrane and the kids are going out to eat and Gaz picks Bloaty's Pizza Hog for the occasion. The only problem is Dib runs off to infiltrate Zim's lair and Membrane insists they can't go until Dib gets back.