Abigail, the Mad Scientist who created Horrible, can't watch him every second. He has his own things going on, she has hers, and she has her Secret Identity to maintain on top of that. So Horrible takes side-jobs and hobby projects. He's worked on the wires of houses, maybe yours, making the lights flicker, and skittering and scratching around the ceilings with his long, thin claws. Been the shadow that stood outlined starkly on a wall on broad daylight, with nothing to cast it. The strange, crawling speck in the corner of your vision, always gone when you turn your head, but always hovering just at the edge, in the places you almost don't see. The imaginary friend your parents gradually worried about more and more, as time passed, as time passed and you got older, you still insisted you could see him...whenever no one else was around. Then you have said he talks to you, and your parents started giving each other meaningful looks. When he started telling you to set fires, that was when they carted you off. Maybe even to the Mad Scientist.

It all goes according to plan.

Horrible the Ratigator was the first creature to crawl off the operating table in Abbi Normal's mad scientist lab, the first ever "Imaginary Friends" ooak creature.