Donna Noble
Bernard Cribbins appeared as Wilfred Mott, a supporting character in the 2007 Doctor Who Christmas television special, "Voyage of the Damned"; he then appeared in a recurring capacity as the same character for the 2008 series, as the grandfather of companion Donna Noble. He became a Tenth Doctor temporary companion himself in "The End of Time", the two-part 2009–10 Christmas and New Year special. This makes him the only actor to have played two companions.