Prentice (Army of Ghosts)
From Tardis Wiki, the free Doctor Who reference
"Grandad Prentice" was the father of Jackie Tyler and the maternal grandfather of Rose Tyler. He smoked. He died from a heart attack in 1997, but according to Jackie in 2007, came back as a friendly ghost. The 'ghost' was in fact a Cyberman, breaking through the Void as a means of travelling to Earth from 'Pete's World'. (TV: Army of Ghosts)
