The adventures of Sheriff Woody and Buzz Lightyear look set to continue in yet another sequel to the hugely popular "Toy Story" series, according to Hollywood star Tom Hanks, who lent his voice to Woody in the three previous films. Hanks revealed the news to BBC while promoting his upcoming film "Larry Crowne," saying that he thinks Pixar is already working on a fourth film, though the animation studio hasn't offered any confirmation. "Toy Story 3" is the highest-grossing animated film of all time, making more than 1 billion U.S. dollars worldwide last year. And it won't come as a surprise if Pixar would like to continue this lucrative franchise.