Starring: Sylvester McCoy, Bonnie Langford

Christmas Eve 3060, and the planet Puxatornee is home to a prosperous human colony. Christmas Eve 3090, and Puxatornee has changed beyond all recognition. The Doctor and Mel arrive, and soon find that something confusing has been happening to history...

Starring: David Collings, Ed Bishop

The Deep-sea Energy Exploration Project was apparently destroyed by dirty bombs in 2039 AD. In 2066 the Doctor discovers the research centre remains intact. The terrible truth about what happened 27 years ago will soon be revealed...