Milo (Gridlock)

In 5000000053, Milo and his pregnant girlfriend 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.

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

Behind the scenes
Travis Oliver went on to play the role of Chris Cwej in audio dramas for Big Finish. In the 2020 short story The Ursine Brood, Cwej remembers several Cwejen known to have deserted from service to the Superiors, including "the one who'd run off to start a family in New New York", with the implication that Milo was a Cwej.