In Godzilla: final wars, a lot of monsters attack cities around the world. But what about all the monsters that weren't in the movie, like Mechagodzilla, Baragon, Megagirus, ect...? That's what Phineas and Ferb wonder whe they hear the gist of Final Wars. But the problem is that they only saw one Godzilla movie. The original, where godzilla was the bad guy. So they assume that all the other monsters were good and send them to protect the cities. They were wrong...