Callen Lennox

Callen Lennox was a companion of the Ninth Doctor. He had a pet dog called Doyle.

Callen and Doyle met the Doctor on Solis Kailya when his mother was researching the planet's properties to revolutionise colony farming. They encountered the Vashta Nerada, who had allied themselves with the Vermine. After they were defeated, the Doctor welcomed them aboard the TARDIS until he could find them a new home. (AUDIO: Red Darkness)

After travelling with the Doctor for a time, Callen and Doyle arrived on The Greenwood. After defeating the giant maggots on board, he and Doyle decided to settle down on New Earth. (AUDIO: The Green Gift)