I'm surprised no one has commented on the leaking graph in the background.
Some of you may know the story of my original plan for P&A. My first idea was for it to be "The Phantom and Gorilla" but I soon discovered that I couldn't draw a gorilla. So, instead, I made a crude slime creature and called him 'Alien'. But I wanted to make a little homage to the duo that never was. Maybe one day we will see 'The Phantom and Gorilla'. Who knows.
Yeah, basically, that's why Alien's father is a gorilla. But they have the same bow-tie! That counts, right?