Changes

*Jack Harkness (John Barrowman) - Also traveled with the Tenth Doctor

*Jack Harkness (John Barrowman) - Also traveled with the Tenth Doctor

===Companions of the Tenth Doctor==

===Companions of the Tenth Doctor===

*Mickey Smith (Noel Clarke) - Although introduced during Series 1, he didn't become a companion until Series 2.

*Mickey Smith (Noel Clarke) - Although introduced during Series 1, he didn't become a companion until Series 2.

*Donna Noble (Catherine Tate)

*Donna Noble (Catherine Tate)