User blog comment:AgentP/Phineas and Ferb movie/@comment-1758246-20100204052042

A black hole in Danville would mean the utter annihilation of the whole human race and Earth. You'd have to think of something simpler and less dangerous. Perhaps Doofenschmirts creates a Hurricane-Inator and brings forth high-speed winds that catch the children off guard. Perry must find his way through the chaos created by the hurricane and defeat Doof. Phineas and Ferb must search for Isabella, who got blown away by the strong winds. They create something that allows them to walk through the hurricane in order to find Isabella and bring her to safety. Meanwhile Isabella is hiding from the dangerous winds somewhere down on the other side of Danville. The tide is getting higher (Overflowing the M.O.A.T), threatening to flood the side of Danville she is at.

Black holes don't take you to other dimensions (Or whatever you were thinking), they crush you til you're basically flattened out of existence.