A relative unknown will take over the title role of Doctor Who in the British science fiction television show , making him the 11th time lord in 45 years to travel across the universe in the Tardis time-ship .
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A relative unknown will take over the title <m> role </m> of Doctor Who in the British science fiction television show , making him the 11th time lord in 45 years to travel across the universe in the Tardis time-ship .
A relative unknown will take over the title <m> role </m> of Doctor Who in the British science fiction television show , making him the 11th time lord in 45 years to travel across the universe in the Tardis time-ship .
Matt Smith , 26 , will make his debut in 2010 , replacing David Tennant , who leaves at the end of this year .
He is the youngest actor to play the part .
Smith has previously appeared on TV , in films and the theatre and is best known for appearing in the BBC 's The Ruby in the Smoke .