Prologue
When he was 10 years old, Irving McAllister knew exactly what he wanted to do with his life.
He would go to Phineas and Ferb's house every day. He'd participate in whatever wild and crazy thing they were doing. He'd take pictures and put them in his scrapbook. And then he'd write about the day in his notebook.
He'd take all the same classes Phineas and Ferb took. He'd go to the events they went to. He'd go to the same college. He would continue being their living shadow. And all the while, he'd take pictures and write in his notebook.
When Phineas and Ferb became famous inventors, he'd assist them. He'd probably stick with Phineas more, because he wasn't very good at actually building things, though he was better than Baljeet. He would, of course, take pictures for the scrapbook and write in the notebook.
And then he'd release their biography. It would cover their entire lives. It would have pictures from his scrapbook. They would be extensive. It would include excerpts from his notebook. It would feature quotes. Not just from Phineas, either. There would be witticisms from Ferb, things Candace said, quotes from Isabella, and maybe even a tidbit from Django. Irving even had the title planned out: Phineas and Ferb: A Lifetime of Brilliance.
Maybe, somewhere along the line, he'd get married. A nice girl, funny and intelligent, preferably someone who loved the boys as much as he did. Maybe one of the Fireside Girls. But that wasn't so important to Irving. Not as important as the biography.
When he was 16 years old, things became a whole lot more complicated for Irving.