Tardisode 07: The Idiot's Lantern

In an ordinary 1950’s household a deliveryman uncovers a brand new state of the art television set to an excited old woman.
That night she sits down in preparation to watch the set as tendrils of red electricity buzz around the device. She concludes that it is not working and gets out of her chair to hit the set in order to try and make it work.
However as she does so the red tendrils of electricity flare up to and begin to break free of the television screen. They pursue her as she retreats back to her chair in terror and make a move towards her face.
Some time later the old woman is gone; leaving only the television set to broadcast a report on the upcoming coverage of the following day’s coronation of Queen Elizabeth II…