Mr. Magpie is the secondary antagonist of the Doctor Who episode "The Idiot's Lantern". He was an electronics store merchant and the unwilling accomplice of The Wire.
In 1953, in the days leading up to the coronation of Queen Elizabeth II, Magpie was visited by The Wire, who had just arrived in energy form in that time period. The Wire then lashed out at Magpie with energy, stealing his face, but then giving it back to him.
Magpie then began selling television sets cheaply to everyone in the area to watch the coronation, seemingly because it was his "patriotic duty", but in reality, he was doing the Wire's bidding, as the Wire planned to use the televisions to feed off of the humans' energy and regain its corporeal form, and in exchange for Magpie's help, it'd allow him to keep his face. However, Rose Tyler got suspicious when she saw red lightning coming from the back of the television in Eddie Connolly's home. She tracked Magpie down and began asking him why he was giving away the televisions so cheaply. Though Magpie tried to shoo Rose away, he finally cracked under all the pressure and confessed. This prompted the Wire to steal Rose's face and leave her abandoned in the street, which enraged the Tenth Doctor.
On the morning of the coronation, the Doctor, with the assistance of Tommy Connolly and Detective Inspector Bishop, headed down to Magpie's shop, where the Doctor demanded that Rose and everyone else who lost their faces (including Tommy's grandmother) be returned. It was here that The Wire confessed to its plan, to transmit itself to the estimated three million viewers watching in the vicinity and transmit back energy it would use to reconstitute its corporeal body. It then tried to steal the faces of the Doctor, Tommy, and Bishop (and was successful in doing so to Bishop), but the Doctor used his sonic screwdriver to rescue himself and Tommy. Magpie then used a small portable television to take the Wire to Alexandra Palace to finalize its plan. As the Doctor pursued Magpie, Magpie begged the Wire for the whole ordeal to end and to just give him peace, to which the Wire responded by coldly disintegrating him into dust.