In an underground lair, of O.W.C.A, Major Monogram's brother, Henry, who is a vampire hunter from Romania was on his computer hunting down Heinz. "I can smell another vampire." He said. "It's not that goth teen I hunted years ago. It's Heinz Doofenshmirtz!"Henry said panicking. He didn't know what to do. Should he hunt the mad vampire scientist or let a secret agent platypus get him?

At Phineas and Ferb's backyard...

"Ferb, what should we do today?" Phineas asked his step-brother. "I don't know. We can let Perry fight Doofenshmirtz while we can make a laser tag arena with state-of-the-art laser technology." Ferb suggested as Perry gave them a thumbs-up as he went to get his mission. "Hey, Phineas. Whatchya doing?" Isabella asked. "Ferb just gave us an idea to make a laser tag arena!" Phineas said as Buford, Baljeet, and Irving arrived in the backyard

In Candace's room.

"What should I do today?" Candace asked herself. THUD! Perry had accidentally landed in her room. "Perry, what happened?" She asked her semi-aquatic secret agent mammal. "Can you use your super strength to make a hole so I can go to my lair?" Perry asked. "I'm late to my mission briefing with Major Monogram and might need your help stopping Dr. Doofenshmirtz," Perry said.

"Okay," Candace said as used her fists to punch a hole in the floor of her room. Then, she and Perry jumped through the broken floor and landed in Perry's lair, and Major Monogram was surprised to see Candace. "Good morning Agent P and Candace." Major Monogram said.

Perry chattered. "What is Doofenshmirtz up to?" Candace asked. "For top secret reasons unknown to us, he has made a Pool-inator." Major Monogram said. "Sir, it's not top secret, he posted it on his blog." Carl said.

"Geeze, Carl. I'm trying to keep this-Wait, is this the same blog as the top ten celebrity face swaps?" Major Monogram asked. "Hold on Agent P and Candace, you've got to see this. It's the Rock's head on the Queen's body!" Major Monogram laughed historically. "Did you see number eight, sir?" Carl asked.

"Number 8? Which one is that" Monogram asked. "Devi Devido and the Groundhog from Groundhog Day," Carl replied. "Yes. Carl, sign me up for updates from this website." Major Monogram asked. "We already are Sir, that's how we found out about the Pool-inator." Carl replied getting the four of them on track.

With Phineas and gang...

"Alright," Phineas started. "We've got all the materials. All we have to do is build it." Phineas added as Ferb climbed into the CAT truck. "Aren't you guys vampires?" Isabella asked. "Right. Ferb, we can use our vampire powers." Phineas hollared to his brother who turned off the engine and flew down as a bat.

"Thanks for the idea, Isabella," Phineas said as he carried the fake dragon. "You're welcome." The fireside leader said as she and her squad started helping out with the project. "Hey, where's Perry and Candace?" Baljeet asked. "They're not here so they are probably on a hunt right now." Phineas said almost blowing his double-life cover