PHINEAS AND FERB creators Dan Povenmire and Jeff “Swampy” Marsh have inked exclusive, multi-year, multimillion-dollar deals with Disney Television Animation, reports Deadline.com. The detail puts the duo on another season of the series, attached to the feature film and in development on a spinoff series. Povenmire and Marsh are writing the script for the feature. Additionally, the agreement gives the artists portions of the lucrative merchandising money.