Ferb was off to try and find Phineas. He had a feeling his bro needed his help. Of course he couldn't do anything until he found out where the heck his bro was. Phineas wasn't one to go without a trace, so if he could find clues, he'd be able to find his brother for sure. The only issue he had was where should he start to look? Perhaps Jeremy's? No, Jeremy said he'd gone running off to meet Isabella to tell her something. That meant he disappeared at some point after that. Isabella had also disappeared but he had no idea when. He remembered texting her, so she disappeared somewhere on her way here. Ferb was certain their disappearance was by the same source. It couldn't be the same time since judging by the timeline between Jeremy's saying Phineas left was a lot later than Isabella should have been at the house. Ferb had a feeling this was going to be a little difficult, but he couldn't waste any time.

Jeremy couldn't help but feel guilty for Phineas' disappearance. He was supposed to watch him, and he let him leave without any supervision. Then again, nobody should have to worry. Phineas has been on his own before, right? Nothing ever happened in Danville, as far as he knew. Why would Phineas go out alone if he was worried about something? Plus it was just down the road, so why should they be worried about him? Perry was loafing around in the back, and he could see the worry on Jeremy's face. Jeremy spotted the monotreme, and he picked him up.

"Oh, Perry," Jeremy sighed, "how could I have been so careless with Phineas? I mean he's so young and I didn't watch him like I said I would. Ugh, if anything happens to the little guy, I'll never forgive myself!"

Perry wanted to tell him it wasn't his fault, but he'd blow his secret. What could have possibly happened to Phineas? Isabella too? Something fishy was going on for sure. It was then he remembered he had secret cameras hidden all over the neighborhood. He just needed to get away from Jeremy...but how? Giving a sidelong glance at the teen, he could tell he was distraught. Perry noticed they seemed to be the only two in the yard. Perry sighed, and he squirmed out of Jeremy's arms and went to one of his lair entrances.

"Perry, where are you going?" Jeremy asked.

Perry did nothing as his elevator took him down to his lair. Jeremy followed him down like Perry thought he would. Soon they were in Perry's lair.

"Whoa, what's this place? Did Phineas and Ferb build this for you, boy?"

When Jeremy looked down at Perry, he was standing on his hind legs with his fedora on, holding a note.

'I've got an idea Phineas and Isabella were kidnapped'

"Hey! G-gimme back my phone!" Phineas made an attempt to run for his phone, but he felt a large claw grab his arm, barely missing his arm with its sharp teeth. Phineas turned his head suddenly to see the Pandaborg glaring at his prisoner. He struggled as the cyborg pulled him back, "Wh-what's that?"

Charlene-2 sighed, "Honey, I think we might have to just turn him into a boyborg. He's clearly not going to cooperate with us."

Heinz-2 only grinned seeing Phineas tremble in fear as he approached the boy. Phineas made quick effort not to make eye contact with him. He knew as well as anyone that if he made eye contact with him, he'd see terror and have an advantage over the child. Unknown to Phineas he already had the upperhand. He commanded the Pandaborg to release him. Phineas instinctively backed away right into the waiting hand of the dictator. He struggled, but Heinz-2 pushed him forward.

"So, you still want to resist us and be stubborn?"

Phineas said nothing as he lead him to another section of the room where there was a tarp with a chain expanding to the ceiling. With one hand on Phineas' shoulder (to keep him place) and the other grabbing the tarp, Heinz-2 pulled the tarp uncovering a cage and inside...Isabella.

"ISABELLA!" Phineas gasped, "Wh-what is she doing here?!"

"Well she had a part in your capture, but I kept her around since she'd be good motivation to do exactly as I say," Heinz-2 said, and he pushed Phineas harshly to the cage, holding onto the chains connected to his wrists, "Go say hi."

"Isabella!"

"Phineas!"

"Wh-wha...I don't understand. What did he mean when...you wrote the letter…" Phineas whispered realization dawning on him.

"I'm sorry, Phineas...he forced me."

"I believe you," Phineas smiled to his best friend, thinking in his head she looked so cute as a damsel in distress. He quickly shook the thought, "How'd you end up here?"

"Long story…"

Phineas nodded, but felt himself get yanked back to Heinz-2, "So...now that you know we have your precious friend. I suppose you're rethinking some things, huh?"

"Phineas, don't listen to him! I'm fine, okay?"

Phineas' head seemed to follow whoever was talking. Heinz-2 grabbed the boy's face, forcing him to look him in the eye, striking fear into the inventor's eyes. Heinz-2 grinned maliciously at the trembling ten year old. He had him right where he wanted him.

"Pay no mind to her, Phineas. She doesn't quite know what's at stake here. Would you like me to tell you exactly what will happen if you continue to misbehave?" Phineas shook his head, "Great, here's the deal, kiddo. If you refuse us or anger us in anyway way...see those over there?"

Heinz-2 pointed over at one of the pharmazombies, and it didn't take long for Phineas to realize just what was going to happen if he upset his captors. He gulped, and then he nodded in understanding. Seeing he got his point across, Heinz-2 let go of Phineas and reapproached his family to watch Phineas collapse to his knees. Phineas had no choice. If he didn't wanna lose Isabella, he had to do as they say. He then looked them straight in the eye.

"A-alright...listen. I want to set some ground rules if I'm gonna help you. First, whatever I build, I want your assurance my friends and family will not be harmed. That includes myself and Isabella," Phineas stood up with his brave face.

"Fair," Heinz-2 replied.

"Second, I may be your prisoner, but I'll need nourishment and a place to sleep if I'm to have the strength to build."

"Done."

"Last...let Isabella go…"

"NO!"

Phineas turned his head to Isabella, grasping the bars, "What?"

"No, I'm not leaving you. If you're prisoner, I'm prisoner with you, Phineas…"

"But…"

"No buts. I'm staying with you."

Phineas then turned back to the Second Dimension Doofenshmirtzes, "Alright...new condition. If I'm not working on inventions, I get to spend time with Isabella, and if we have a cell, I'd like if we are close to each other and able to touch or at least speak to each other. Fair?"

Phineas stood there waiting for their answer. The three discussed it, and soon they turned back to him, "Deal."

"However, we have our own condition. If you misbehave and seem beyond the point of obedience, we will not hesitate to turn you into a boyborg," Charlene-2 demanded.

Phineas looked at his feet, then at Isabella's pleading eyes, and back to the Doofenshmirtzes…, "Alright…"