Buzzer (portrayed by Marshall Lancaster) was a supporting character in the Doctor Who episodes "The Rebel Flesh" and "The Almost People". He worked for Morpeth Jetsan as a member of Miranda Cleaves' group of contractors, mining acid out of the land beneath St. John's Monastery.
After the island was struck by a solar tsunami, the team's Ganger duplicates gained self-awareness and fought against their human handlers. At one point, Buzzer went exploring through the monastery to find the missing Jennifer Lucas. He encountered her rogue Ganger which lured him into a trap and killed him off-screen.