The Time Game

Two siblings begin to develop special talents after they find a mysterious box of toys, and soon their parents and even their teacher are drawn into a strange new world – and find a task ahead of them that is far more important than any of them could imagine.

Teenager Cleo's school science project goes quite awry, causing her popular older sister Molly to go invisible.

Michael has big plans to show his cousin Tommy a good time aboard a luxury yacht until he discovers that the yacht he's chartered is actually an old rusted fishing boat. But when modern-day pirates chase the fishing boat, the boys are forced to jump ship, leaving them stranded on a desert island with the boat's captain, Jake Hunter.

The Seventh Doctor becomes the Eighth. And on the streets of San Francisco – alongside new ally Grace Holloway - he battles the Master.