Carter (Let's Kill Hitler)

Carter was the captain of the Teselecta. (DW: Let's Kill Hitler). He effectively saved the Eleventh Doctor's life during the Time Lord's "farewell tour", offering him a favour as thanks for the Doctor's unending justice. The Doctor was copied by the Teselecta and beamed in. This copy was "killed" by River Song on 22 April 2011 at 5:02pm. The Doctor thus both escaped his death and preserved the timestream by ensuring that the fixed point in time which was his "murder" happened (albeit with a double). (DW: The Wedding of River Song)