The Doctor and his TARDIS materialize in October 1930, days before the R101 would end up in disaster. But an alien force is surrounding the airship and its crew from another time.

The Doctor and Charley take a holiday in Venice, Italy. However, there's a plot ensuing the resurrection of a queen to rise again for the muse of her king, as a befallen widower, and the city is to be flooded and sunk within the water.

Finding themselves on a starship, The Doctor and Charley are about to be tried and executed for trespassing. However, more is yet to come. The Cybermen have returned.