It was the rogue scientist from the apartment directly above.
The very same one who filled Ernie and Tim's apartment with the invisible radioactive gas.
and the very same one who was also gonna be exposed to said invisible radioactive gas.
He had light brown hair, big glasses, a light brown goatee, and fair skin, and he wore a whte lab coat over a light blue shirt, grey slacks, and brown dress shoes.
But to the doll-sized underwear-clad Ernie and Tim, he looked about the size of a giant.
The scientist walked into the apartment.
Ernie and Tim stared up at the scientist from where they were.
Almost immediately, the scientist saw them, and walked over to the sofa.
"Hmmm." he said, picking them up, and cupping them both gently in his hands. "Seems my invisible radioactive gas musts've worked on you two." he said to Ernie and Tim.
But what of course the scientist didn't know was that since he'd entered the apartment full of invisible radioactive gas, the invisible radioactive gas was now gonna affect him too!