7. Michael Sheen (House)
How many people get to play an entire planet? Well, Michael Sheen did when he took on the role of House in the acclaimed Neil Gaiman story The Doctor's Wife. Playing a malevolent mind that feeds on TARDIS energy, Sheen gave us one of the fiercest lines from the series' history.
"Fear me, I've killed hundreds of Time Lords..." He had us at 'fear'. Famous for a range of roles, the Welsh actor is perhaps best known for his portrayal of Tony Blair in the 2003 television film The Deal, reprising the role in The Queen (2006) and once again in The Special Relationship (2010). It gives his appearance in Doctor Who a whole new angle doesn't it? Tony Blair trying to take over the TARDIS. Stranger things have happened. Michael has since gone on to tackle some big movie roles including his portrayal of Aro in the Twilight Saga and Castor/Zuse in Tron Legacy.