when omnidroid throws his robo claw at the incredibles the beak catches it and throws it back at him. (disclaimer this story takes place when phineas and Isabella are adults but shortly before they're married) decker out of gratitude decides 'phineas and Isabella because of your bravery, if you wanna get married here in metropolis I can arrange that' phineas and Isabella accept the offer. suddenly a call from kari comes up stating she hired a replacement sitter because jack Jack was too much for her to handle. that's when the limo pulls up at their house and all 6 of them rush in ending with them getting immobilized by syndrome. when he goes on a tangent about his plan to raise Jack Jack as his cohort. when he's about to leave Phineas decides 'I know how we can hit syndrome while keeping jack jack safe, our beak suit has an egg launcher.' they suit up shoot, fly up in front of syndrome and shoot an egg at him and catch Jack Jack the second afterwards and hand him back to helen responsibly. Part 5 is their metropolis wedding and the ending