In the Doofenshmirtz Evil Incorporated pent house was a crazy man. He was an evil scientist trying to get revenge on his brother and, and also trying to take over the Tri-state area. Normally be fail d because of how stupid his inventions could be( and Perry was there to stop him). Now Doof has given up on evil to focus on science. He would build GLaDOS . And portal technology, and turrets and more.
One day as he worked, a lovely daughter by the name Vanessa came and asked what her father was doing. At first Doofenshmirtz said nothing and showed the book he got the idea from. Then he gave the names of the projects. The names were Super black hole time manipulation inator and the Evil Science inator. Then the two started to argue.
"The giant thing you built has a name and the name is GLaDOS. You know why it is named that? Because it stands for Genetic Lifeform and Risk Operating System. That is why it is named that... And don't forget mom into that thing," Vanessa yelled at Doofenshmirtz. The response was a clear " no* followed by a very passionate " Cave Johnson lemon speech" but Vanessa left, and as she did she muttered " My dad is the new Cave. "
Doofenshmirtz had higher plans. Like moving the entire apartment complex he lived in under ground.
Doofenshmirtz would be the new Cave.
Vanessa would be the new Chell.
Charlene would be the new Caroline.
And no one will enjoy themselves in the future because Portal leaked into the world of Phineas and Ferb.