Doctor Who, Season 16 Episode guide
In search of the final segment of the Key to Time, the TARDIS lands on planet Atrios.
In search of the fifth segment of the Key to Time, Romana is captured by native Swampies.
In search of the fourth segment of the Key to Time, the TARDIS lands on the planet Tara.
The tracer takes the Doctor, Romana and K-9 to a stone circle on Boscombe Moor.
The tracer leads the TARDIS to planet Calufrax in search of the second segment of the Key.
To restore the balance of the cosmos, the White Guardian requires the Key to Time.