User blog comment:FossilsDaDaDa/Almost go for launch! I just need.../@comment-3006892-20110810034433/@comment-5151799-20110810153429

Okay then, I'll share a couple of my ideas:


 * They, by coincidence, decide to make a device that takes them into another dimension. I mean, if they have no recollection of already doing that, well, then once the idea pops up, why shouldn't they?
 * Phineas and Ferb's 2nd Dimension selves come to the 1st Dimension in need of help for... something. I don't know what. You come up with that, you're the one who's writing the story. :P