Cirrus@Austlit

Two schoolteachers, Ian Chesterton and Barbara Wright, become concerned by the unusual behavior of their fifteen-year-old student, Susan Foreman. When they follow her home, they meet her mysterious grandfather, the Doctor, and find themselves unwilling passengers on his time ship. The first episode deals with Ian and Barbara's discovery of the Doctor and the TARDIS in a junkyard in contemporary London. The following three episodes are set amid a power struggle between warring Stone Age factions.

Source : 'An Unearthly Child' - Wikipedia entry http://en.wikipedia.org/wiki/An_Unearthly_Child (Sighted 4/05/10)

Drawn into the orbit of the planet Vortis, the Doctor and his companions (Barbara, Ian, and Vicki) encounter three sets of non-humanoid inhabitants: the Zarbi, the Menoptra, and the Optera. The Zarbi are under the control of a sinister, spider-like central force, the Animus, which uses gold as a conductor for its mesmerising power. After a disastrous ambush of the spearhead Menoptra force attacking the Animus, Barbara manages to destroy it with an act of concentrated willpower. With the Zarbi freed from the Animus's malevolent control, they, the Menoptra, and the Optera are free to live on Vortis, while the Doctor and his companions leave in the TARDIS.

In 2018, the 'Australasian Zone' is controlled by the Salamander, a dictator who controls a population frightened by a recent apocalypse–and who bears a striking resemblance to the Doctor.

'The Doctor and Clara, with their old friend Rigsy, find themselves in a magical alien world, hidden on a street in the heart of London.'

Source: BBC synopsis.

'London, 1814. The entire city has turned out for the biggest Frost Fair in decades. But beneath the frozen Thames, revellers are disappearing.'

Source: BBC.

The Doctor receives a mysterious note in a parcel from the galaxy's leading retailer, prompting her, Yaz, Ryan, and Graham to explore the warehouse moon orbiting the planet of Kandoka.