Joseph Serf has launched his new SerfBoard, the must-have computer that no one can resist owning. Intrigued, Sarah Jane takes Luke and Sky to investigate what is so compelling about Serf and his business. Meanwhile Clyde and Rani take a SerfBoard to pieces, suspecting alien technology may be the answer. Everyone wants the new SerfBoard - and why not? What could be so dangerous about a computer?

Following the death of Sarah-Jane Smith, her friends and allies reunite at a memorial service to pay their respects.