Hugh Grant has signed on to do the lead voice in “The Pirates! In an Adventure With Scientists,” the new stop-motion 3D toon produced by Aardman Animations for Sony Pictures Animation.Grant, starring in his first animated role, voices a bearded pirate captain who travels far and wide in a quest to win the much coveted Pirate of the Year Award. “Pirates” is helmed by Peter Lord, a founding partner of Aardman and the director of “Chicken Run” (with Nick Park), and is co-directed by Jeff Newitt. Gideon Defoe pens the script, based upon his tomes. Lord, David Sproxton and Julie Lockhart produce while Carla Shelley exec produces.