Ian McKellen Andy Serkis return to Middle Earth January 11, 2011 Gandalf and Gollum head back for The Hobbit! Hot on the heels of Elijah Wood joining The Hobbit, two new Lord of the Rings actors have signed on to return to Middle Earth. Ian McKellen has finally signed on to reprise Gandalf in Peter Jackson’s two-part adaptation. Andy Serkis has also agreed to return for the motion-capture pro role of Gollum. Peter Jackson is reportedly courting Ian Holm and Christopher Lee to return for the project.