"You'll never destroy us, Zim! I'll escape here and take you down myself!" He thrashes wildly in the straightjacket. "You can call your precious 'Tallests' and tell them that I'll kill them all, too. In fact, your whole species will burn at my feet. How's that for irony?!" He laughs madly, his eyes fixed on a point in front of him.
"Your insults mean nothing, Space-scum. They're weak, just like you. Oh, what? Did that not settle right with you? Did the 'Almighty Zim' get offended by that?"
"You'll what? Ha! Like that'll ever happen!" There is a silence, in which he starts to grow agitated.
"You're… you're wrong! They will see! I'll show the world you're real, and become a hero!" His voice becomes weaker as he speaks. "Then everybody will like me and stop laughing at me… They'll see…"
"I'm not crazy…"
o0o
I watch this all unfold behind the glass. I had it installed specifically for his room. Every night I take off an hour early to come watch him. I don't ever go see him, just… observe. And every night shows the exact same thing: Dib arguing to a non-existent alien in an empty room. And like every night, I leave, shaking my head as I go.
My poor insane son.
I do not own Invader Zim. And know this: I feel like I'm giving the Professor Membrane way too much credit. In all honesty, I hate him.