Sir Ian McKellen wants to put on Gandalf's cloak for a fourth time in a movie version of The Hobbit.
He told a journalist that he would be "very happy" to play Gandalf again, if a film version of The Hobbit is made.
He added: If I am still functioning and working well, it is very likely I would be asked to do it."
The Hobbit is about Bilbo Baggins' adventures, and is where the ring that has to be destroyed in the Lord of the Rings first appears.
The Lord of the Rings books have already been made into a hugely successful film trilogy, which has made masses of money for film company New Line.
Those films were all directed by Peter Jackson, but he's fallen out with New Line now, so the film will be directed by someone else.
Sir Ian said he's spoken to Jackson about The Hobbit, and the director told him: "Of course, you must play Gandalf whether I direct or not."