A pair of scientists investigate a mysterious death.

Ace returns to Perivale to visit her friends, only to find they have been abducted to an alien planet by a race called the Cheetah People who were shown the way to Earth by the Master. The Doctor must find a way off the planet before they all succumb to its savage influence.

The everyday lives of working-class residents of Albert Square, a traditional Victorian square of terrace houses surrounding a park in the East End of London's Walford borough.

The everyday lives of working-class residents of Albert Square, a traditional Victorian square of terrace houses surrounding a park in the East End of London's Walford borough.