474 (Sleep No More)
From Tardis Wiki, the free Doctor Who reference
A five-year-old Grunt labeled 474 was assigned to a rescue crew in the 38th century.
While on the mission, Osamu Alml-Chopra, another member of the crew, fell under 474's fancy, and it stayed with Chopra even when they became separated from the rest of the crew. When Chopra was injured, 474 bravely fought off the Sandmen but was killed in the process. (TV: Sleep No More)
