Dennis Hopper in talks for 'Doctor Who'

Dennis Hopper is in talks to make a guest appearance in the next series of Doctor Who.The 71-year-old American actor is being lined up by show producers to play a baddie in series four, which starts filming next month.A source told The Sun: "Dennis is a big fan of the show and bosses are really keen to get him on board. Discussions have been going on for some time but his diary is proving a nightmare to work around. However everyone is hopeful they can make something work."Hopper is best known for his roles in Blue Velvet and Easy Rider.