Milo (Gridlock)

Milo and Cheen kidnapped Martha Jones so they could travel in the fast lane of the Motorway. Milo told Martha, once she was inside their car, they would drop her off when they reached their destination in six years.

When they reached the fast lane, Macra attacked their car. They escaped when the Tenth Doctor opened up the motorway allowing all "residents" of the Motorway to escape into New New York.

Cheen and he dropped Martha off at the New New York Senate to meet with the Doctor, the Face of Boe and Novice Hame. (TV: Gridlock)