A small comet landed on DEI which revealed a symbiote, while Doof was sleeping, it crawled on Doof's hand and bonded with him and surprisingly became invisible.
The next day, Doofenshmirtz made a slippery-inator, Perry came but didn't know Doof had an invisible symbiote, He was on his way, Doof tested it by shooting it in the sky, Perry was on his way on his jetpack receiving some info from Major Monogram on his Wireless Bluetooth headset, Major Monogram was talking when he said "And Doof has an invisible...", just before he was going to say he had a symbiote the slippery-inator beam hit Perry's headset causing it to slip and fall off his ear.
Perry reached DEI.
