It's the day of the event and the "guests" arrive, very confused. And my OC Claire awaits their attention.
The group looks around and notices the giant screen at the front and they look around and notice all the other people there and get confused. The usual suspects like Phineas, Ferb, Candace, Perry, and so on have arrived and are very confused on why they are there.
Claire: Hello everyone, I know you are all confused as to why you are here and by extension who I am. Well, I have gathered you all here to watch a very interesting show about yourselves. My name is Claire, but I like to be known as Dr. Heinz Doofenshmirtz's number one fan. In fact he's the lovely former evil scientist in the lab coat right here in the front row. *points to Heinz and everyone turns to look at Heinz while he is embarrassed* Don't be shy, Heinz. Say hello.
Heinz: Hello! Is there an explanation for why we are here exactly, and us specifically?
Claire: Of course! You are all apart of this sensational top tier show in my dimension called "Phineas & Ferb" and to those in the back "Milo Murphy's Law" and we are here to reveal all to the Tri-State Area so no more secrets around here. And no, Francis, there is no Amnesia-Inator or any way to reverse what is revealed here. And no Agent relocation to a different host family either. Anyway, on with the show. Let's save the Q&A til after the first season is wrapped up, and we will do another one at the end of each season. Let's get this party started, shall we?
*Francis sits nervously and anxiously while LOVEMUFFIN have a conspiratorial look on their faces* (Esmeralda Poofenplotz just contemplates life while the credits start rolling.
