Jossi and Karter

Jossi and Karter were two friends who were trapped by the Lords of Jelsen and forced to participate in the race to the death against the Tenth Doctor and Heather McCrimmon. When the Doctor engineered a draw and disrupted the capture system, by crashing a ship into the control tower, they were able to make their escape and give the Doctor and Heather a lift.

(DWA:''The Highest Stake)