Carl Harris

Private Carl Harris was a UNIT soldier during Operation Blue Sky.

Entering the ATMOS factory with other UNIT troops during their raid of the complex, he and Private Steve Gray discovered a cloning pool in the building's basement. The Sontaran General Staal commended him for his leadership skills.

Staal hypnotised the two troopers in order to have them capture Martha Jones in order to make a clone of her. Harris later teleported the Doctor's TARDIS onboard the Sontaran flagship. Soon after, they were killed by a Sontaran soldier during the battle with UNIT at the AMOS factory (DW: The Sontaran Stratagem / The Poison Sky).

Alternate timeline
In an alternate universe he was the UNIT officer on scene when the Doctor's body was recovered from the Thames. (DW: Turn Left)

Behind the Scenes
His first name, Carl, was given in The Time Traveller's Almanac.