Director Tom McGrath (Megamind) may make his live-action debut directing denizens of the afterlife in Rentaghost, starring Ben Stiller.  The picture, inspired by a British children's TV series, follows “an American turnaround consultant who is sent to the UK to reinvigorate a failing company," and finds jobs for ghosts and ghouls. Having co-directed all three of the wildly successful Madagascar movies, McGrath would reunite with Stiller, who voiced Alex the Lion in the animated films.Before Fox picked the picture up from Warner Bros., it had starred Russell Brand in the lead role.  With Stiller attached and Night at the Museum scribes, Thomas Lennon and Robert Ben Garant writing, McGrath's addition could further seal up box-office gold as families will likely head to the theaters in droves when the movie opens next year.  McGrath's entry into negotiations comes via Variety.