User blog comment:Anomymous Writes/Crossover with Phineas and Ferb/@comment-5145527-20130824000925

"Phineas,Fish,and Ferb in Gravity Falls"(AFTER SEASON 3 OF GF)

(The P&F family,and the Pines twin's story)

Phineas and Ferb's family are going to a trip to Oregon but Perry became "sick" (He needs to do a very special mission in Danville) and Phineas thinks Perry might be lonely so the family goes to a Pet Store somewhere and buys 3 odd looking fish.When the arrive in Oregon,they camp in a log cabin in the forest of Gravity Falls.In there Phineas and Ferb meet Dipper outside of the tourist trap,The Mystery Shack who seems shocked.He tells Phineas and Ferb (Somehow) that Gravity Falls isn't what you seem and is filled with strange creatures,curses,and at *specific date* that the people will be cursed by Bill Cipher (Who was summoned by an evil scientist)and the creatures will attack.Phineas,Ferb,Candace and the Pines twins get ready for everything.(STORY GOES ON....)

(Milo,Bea,Oscar and Perry's Story)

Milo,Bea,and Oscar have a dramatic time saying goodbye to they're families and friends in the tank since the P&F family bought them.They we're put into a tank in P&F's house and the family left.Perry's watch begins to ring and the three fish noticed Perry.Perry puts on his hat and answers his watch.Major Monagram tells Perry a "Funny Story" that Doof is in vacation in Oregon has found a book in a hiding spot and summoned a demon and tells him to take over the world and he needs some back-up.After that Monogram and Carl laugh.Milo,Bea and Oscar hear Major Monogram and suddenly Milo says OOH CAN WE HELP.Perry nods..trains them and gets on a rocket of Gravity Falls.(STORY GOES ON....)