After a lonely architect who works with Dan has dinner at the Conners', he attempts to buy their friendship.

Actor Judd Hirsch narrates this behind-the scenes look at what makes New York City tick. Water, power and waste are the critical systems that usually work, but sometimes break down with disastrous consequences.

England, 1883. The Doctor brings Ace to a house called Gabriel Chase in her home town of Perivale. The Gothic mansion is presided over by one Josiah Samuel Smith - an evolved alien brought to Earth in a stone spaceship that is now in the basement beneath the house, and which still holds an ancient evil capable of wiping out the world.