Big Bad Parodoxes

Phineas and Ferb use the time machine again.

Summary
Phineas and Ferb reuse thier time machine again, and accidentaly make Lawrence not exist. That makes Ferb disappear to, and then Perry disappears and is no longer an agent, still at the pound. Phineas and Candace go back in time to London, and see that Ferb is an only-child of Lawrence. Ferb doesn't believe that they are brothers. They brought Ferb with them to the future to have proof, but accidentaly go to far, and see that Danville has been taken over by Dr. Doofenshmirtz. Phineas wasn't married to Isabella since they never moved, and Ferb wasn't married to Gretchen or Vanessa. Ferb still isn't convinced, so they go back to the day they built the rollercoaster. Nothing is the same, because Phineas built a less extreme, boring one, like the one at the state fair. Then the future Phineas walks up, causing the past one to get scared and run towards the track, and was run-overed and killed by the roller-coaster. Candace ran to the time machine, and noticed that a giant tinfoil ball was coming, she hopped out. But she then saw two future versions of herself, and Candace ran back to the right time machine. She then noticed a parodox list, showing the maxium amount of parodoxes that can happen. She saw that the one that just happened was the most, then a black hole opened up. Candace flew in,and then got out her phone. She called the future/past Phineas and Ferb who didn't time travel yet, and told them to not use the time machine later on that day. Phineas and Ferb didn't, causing Candace to be sucked in a black hole in a black hole, and ceased to exist. Meanwhile, none of this episode ever happened...