Phineas, Ferb, and Perry sat under the tree in their backyard doing nothing. Isabella, Baljeet, and Buford then walked into the backyard.

"Hi Phineas," said Isabella, "Whatcha doin?"

"Ferb and I have been doing nothing all morning." Replied Phineas as he and Ferb got up.

"That means you can help settle an argument I had with Buford earlier this morning." Baljeet said to Phineas.

"I told already told you that you can put as much gravy in a turkey as you want!" Buford angrily said to Baljeet.

"There's such a thing as too much gravy!" Replied Baljeet.

"Calm down guys." Said Phineas.

"I'm sure Phineas and Ferb can build a machine that puts the perfect amount of gravy into a turkey." Said Isabella.

"Fine!" Said Baljeet and Buford.

"Actually Ferb and I have decided to stop inventing." Said Phineas

Ferb nodded.

"What?!" Said Baljeet, Isabella, and Buford at once.

Meanwhile Perry was in the house in the living room. He stood up straight and put his fedora on. Perry leapt into the air and opened the face of a clock and entered it.

Perry fell down a chute and landed on the chair in his lair.

Major Monogram appeared on the screen.

"Good morning Agent P." Said Monogram. "Doofenshmirtz has recently bought a history textbook, a computer, a conveyor belt, and a phone booth."

"Actually it's a police box." Said Carl offscreen. "They used to be common in Britain."

"I wasn't talking to you Carl." Said Monogram in an annoyed tone. "Agent P go out there and stop Doofenshmirtz."

Perry saluted Monogram and left the chair.

"Ferb and I have lost interest in making new inventions. We have been thinking of being accountants. Ferb has gotten really good at it. Show them Ferb.

Ferb opened his mouth.

"Are you two feeling all right?" Isabella asked Phineas and Ferb, interrupting Ferb.

"It's just like the time you two acted dull and boring." Buford said to Phineas and Ferb.

"Just because Phineas and Ferb want to be accountants does not mean something is wrong." Said Baljeet. "I am sure they will invent something tomorrow."

Suddenly a ball of lightning appeared out of nowhere in the yard and Tuddrussel, Larry, and Otto appeared along with a scorch mark in the grass.

Before Phineas, Ferb, Baljeet, Isabella, and Buford could make sense of what happened Tuddrussel brought out his lazer gun.

"It's go time!" Said Tuddrussel. "Hands in the air!"

Phineas, Ferb, Baljeet, Isabella, and Buford raised their hands to the air.

"What are you doing you twit?" Larry said to Tuddrussel angrily. "You are threatening children!"

"Sorry, Larry." Replied Tuddrussel as while he put his gun away. "It was a reflex."

"Who are you guys?" Asked Phineas while he and the others put their hands done.

"Allow me to introduce us," said Otto, "My name is Otto and this is Tuddrussel and Larry. We're members of Time Squad."

"What's Time Squad?"

"Allow may to explain." Said Larry. "Time is like a rope, as it is woven at one end the other end gradually unravels. In other words history diverges from its original path."

"Since the future is a utopia with no wars, no pollution, and bacon is good for your heart," said Tuddrussel, "It's up to Time Squad to keep history on track."

"Neat." Said Phineas. "I'm Phineas and this is my step-brother Ferb, and our friends Isabella, Buford, and Baljeet."

Ferb raised his hand to say hello.

"What Larry said does explain why Phineas and Ferb want to become accountants instead of inventing." Said Isabella.

"Phew," said Tuddrussel, "At least we know what we're supposed to do now."

"That does not inspire confidence in your ability to protect the future." Said Baljeet.

"Have to agree with Baljeet on that one," said Buford, "Arn't cops supposed to know stuff?"

"Hey!" Said Otto. "The computer was glitching and I am from the 1990s. We have no knowledge about this time period."

"Can you try a practice check by checking out my family tree?" Asked Isabella hoping to see if she marries Phineas.

"Let me check," said Larry as he opened up his wrist, "It's still malfunctioning."

"That's okay." Said Isabella.

"Since you travel from time have you met famous people from the past?" Phineas asked Otto, Tuddrussel, and Larry.

"Sure," replied Otto, "When we first went to the past together we had to stop Eli Whitney from making flesh eating robots instead of the cotton gin.

"That's pretty cool." Said Buford.

"That does not make any sense," said Baljeet, "the technology for robots did not exist in the 18th century."

"Ferb I know what were going to do today." Said Phineas. "If only Perry was here to see this invention. It's going to be one of our best yet."

"Who's Perry?" Asked Otto.

"He's my family's pet platypus." Said Phineas.

"Ivan..." Said Tuddrussel sadly.

"I know what your all thinking," Larry said to Phineas, Ferb and their friends, "Who is Ivan? Long story short we kept Ivan The Terrible as a pet for awhile and let us leave it at that."