 He also served as a large contributor and producer for several British feature films, working for the company BKN New Media Ltd.

Around 2005, Povenmire contacted Marsh, notifying him that a pitch for "Phineas and Ferb" had been somewhat successful and The Walt Disney Company had shown interest in producing the series but wanted to see an eleven-minute pilot.Marsh immediately accepted and began packing.He had already booked a vacation to Los Angeles, while Povenmire had plans to travel to France; while Povenmire set up a sidetrack to travel to England, Marsh flew down to Los Angeles for two days where he devised a plot outline for the episode "Rollercoaster”.