This was not "classic Invader Zim" at all. Classic Zim is a horrible, disgusting, dystopian future where Zim has no qualms about horribly mutilating, mutataing, maiming, or flat out murdering humans. Classic Zim would have had Zim making Clembrane from Membrane's amputated arms and Dib's DNA, fucking up the cloning process so he was a lumpy, mutated dib/membrane hybrid full of extra organs and shit he'd cough up and try and make food for the kids with. Not that shitty pink blob we got. Classic Zim would have had the peaceday bracelets infect the host children like parasites and turn them in to braindead green semitransparent versions of themselves after being shot by the moose, never being cured by the end of the episode and the world being too stupid to realize something had happened. Classic Zim would have had his plans foiled by something extremely stupid and commonplace within humanity, like the Florpus being an actual living entity but the stench of humans being so great that when it tried to eat them, it spat them back out in disgust someplace near where earth originally was, but not exactly, leaving a noticeable change in the solar system, etc. that only Dib calls out to everyone, who as always, ignores him.
No, this wasn't Classic Zim at all. This was a silly XD SO RANDUMB, slightly longer and heavily censored family friendly episode made for netflix.
