ChibiGals
After declaring it will be their last summer to do something wild before they grow up into mildly well mannered adults, Phineas and Ferb (along with their friends and Candace), decided to do one final awesome best day ever. Little did they know that after doing so, they wind up in another dimension; Again, but in this dimension it seems that aliens, and humans co-exist together, but some of them aren't friendly and will do everything in their power to keep them from getting home.
Perry and Doofenshimirtz seem to be also in a jam when they are kidnapped by
Gantu as a result of the portal he had also made, then, broke due to it being around the same time Phineas and Ferb made theirs. With hopes of them actually fixing the portal while Phineas and Ferb make use of the new world and find a way to get home.
But an evil plot is about to unfold that would put both worlds in jeopardy can Phineas and Ferb unravel it and help the creatures and odd characters from this world in time for them to get home before their Mom comes home and offers them pie?