"I don't know, he is nowhere to be seen." Leo answered. "Does he disappear like that often?" "Yes, every day, actually. I sometimes wonder where he goes." Phineas claimed. "So, do you have the blueprints for the original portal that you guys just came out of?" "Let me see...Ah, here it is!" Donnie exclaimed. "Ok, so let's start building!" Just when they were about to start building the portal, an orange-haired girl appeared. "Phineas and Ferb, Mom is just about to go out running errands, so I am supposed to..." Her words were interrupted when she saw the 4 giant green turtles. "Phineas! Who are these people, and why are they in the backyard? Wait...why do they look like turtles?"

The 4 turtles look at her uneasily, partly because having more people knowing that they exist may make their existence lesser of a secret, and partly because of her sudden outburst. "Guys, meet my sister Candace. Candace, I would like you to meet Leonardo, Donatello, Raphael and Michelangelo." The turtles nodded at her politely.

"They came from an alternate dimension. They accidentally came to our dimension and we are going to build an inter-dimensional portal for them. Wanna join in?" "Uh, no thanks." Candace refuses. "Phineas and Ferb, you are so busted! I am telling Mom! MOM!" She turned and ran back into the house. The turtles immediately vanished into their hiding spots. "There. You see Mom? There are giant talking turtles in our backyard!" Candace triumphantly showed her mother the backyard.
"Candace, I see nothing. Are you sure it's not your imagination?" Candace looked at the backyard. "Bbbbbut...they were there Mom! Phineas, where did they go?" Phineas shrugged. "Alright, I am going out to run some errands. Have fun boys!" "Bye Mom!" Their mother went back into the house with Candace taken aback. "Bbbbbbbut..." The turtles went out from their hiding spots. "Woah, how did you guys do that? How did you hide so quickly?" "It's a ninja thing." "So, you guys are ninja turtles? Cool!" Phineas marvelled.

-
"Well, your sister is very...odd, to say the least. Does she do this often?" "Well, she tries to bust us by showing Mom our inventions every time we build one.""Woah! Did you ever get caught? "No, come to think of it, our inventions will suddenly vanish into thin air by the time she and Mom came in. Anyways, I think Mom will love to see our inventions!" Phineas answered. "Ok, let's grab our toolkits and we can start building!" "Great, finally!" Raph exclaimed.

Just then, the backyard gate is opened. "Hey Phineas! What'cha doin?" "Building an inter-dimensional portal." "Cool! Can I join in?" "Sure!" "Hey guys, what's going on?" Buford suddenly came in with Baljeet. "We are building an inter-dimensional portal." "Ok, let's build this then!" "Ok, but you guys should meet our new friends. Hey, where did they go?" The turtles immediately came out of their hiding places. "Sorry Phineas for hiding...again, but we can't let our existence be known to too many people."

"It's ok! Guys, meet Isabella, Buford and Baljeet." The 3 kids waved at them. "Isabella, Buford and Baljeet, meet our new friends. They said that they are from another dimension and they accidentally came to ours. This is why we are building the inter-dimensional portal. It's for them." "Oh." The 3 answered simultaneously. "Then let's build this portal! Do we have the blueprint?" "Got it! Its right here!" Donnie answered. "Ok, then let's do it!" Phineas exclaimed.