Along with his partner, Addams, Rossiter infiltrated the staff of billionaire Joshua Naismith on Earth in order to salvage a piece of equipment referred to by Naismith as the Immortality Gate, and which the tycoon had recovered following the fall of Torchwood. Using a shimmer to disguise himself as human, he, along with the similarly disguised Addams, infiltrated Naismith's inner circle. Their efforts to spirit the Gate away were disrupted by the arrival of the Tenth Doctor and Wilfred Mott. Rossiter and Addams were reluctantly recruited by the Doctor to stop 's scheme to take over the Earth and facilitate the return of the Time Lords. Rossiter was one inch taller than , but was able to disguise himself as one of the Master Race, and helped the Doctor escape the Master's clutches. Then usi