David Tennant was on British television in the 2000s.
David Tennant . He is best known for his roles as the Tenth Doctor in the British television series Doctor Who , Alec Hardy in Broadchurch , Giacomo Casanova in the TV serial Casanova , Kilgrave in Jessica Jones , and Barty Crouch , Jr. in the film Harry Potter and the Goblet of Fire . Tenth Doctor . He eventually parts ways with them all by the end of the 2008 series finale , `` Journey 's End '' , after which he attempts to travel alone for the duration of the 2008 -- 2010 specials before being accompanied by Donna Noble 's grandfather Wilfred Mott on his final adventure in The End of Time .