Another instance where Seth just finds joy in messing with Peter’s head.
I tried to come up with a “backstory” that was a conglomoration of several different generic superhero-type stories. Then I realized the version I came up with was far too extensive to fit into a single panel, so it was cut short to how it appears in the final.
I don’t know if I’ll ever have Seth fully explain his origin to Peter. Some things may be better left unknown to the children.