The TARDIS malfunctions which strands the Doctor in 1999 San Francisco and enables the Master to escape. When leaving his TARDIS, the doctor is shot and forced to regenerate. The newly regenerated the Doctor must fight to save his own eighth body, and the world when the Master sabotages the TARDIS' power source. By midnight on December 31st 1999, the Earth will be pulled through this power-source, a mini-black hole, and only the Doctor can stop if only he can remember who he is...