The Killer

Summary
Phineas and Ferb were sitting under the tree until they hear knocking noises. Linda answers the door. "PHINEAS! A girl named Denise Keller wants to see you!" Linda shouts. Phineas runs to the door, where she sees a pretty girl with short, black hair wearing a dress that looks like Isabella's (only it's black). "Hi, Denise," Phineas said. Denise frowns and pushes Phineas down. Ferb walks over to Phineas. "That girl is pure evil," Ferb said. He turned on a movie.

In the movie was 2-year-old Ferb and his mom and dad. Suddenly, 4-year-old Denise stood in front of them and beat up and killed Ferb's mom. He cried. The movie ends. "So you see, she's going to kill you if we don't RUN!" Ferb says. He and Phineas run away from the house, with Denise following them. Isabella sees Phineas run by her house and runs to him. "Whatcha doing?" she asks. "Running for my life," Phineas said. "You see, there's a girl named Denise Keller who's going to kill us if you don't run!" Isabella turns her head around and sees Denise, and them looks back at Phineas, still running. "I remember when I first heard of Denise," Isabella said. She had a flashback.

In Isabella's flashback, 3-year-old Isabella was walking in a store with her mom and dad. Suddenly, 5-year-old Denise beat up and killed Isabella's dad. Isabella's flashback ends. "So, yeah, you should run," said Isabella. They see a hole into a sewer. "Wait, I've got an idea!" said Phineas. "Eew! I'm not going," said Isabella. Phineas replied, "Oh, you're going, or you're going to die!" "Fine," Isabella said. Phineas, Ferb and Isabella went in the sewer and Ferb closed the lid. They see Emily. "Emily, what are you doing here?" said Phineas, Ferb and Isabella. "I followed you because when I was 1 year old, Denise killed my mother," said Emily. Suddenly all four of them hear the lid open. Then Denise hopped in. "Prepare to die," said Denise. They zoomed off, out of the sewer. Baljeet and Buford followed.

You can come up with what happens next.