5A. THE RIBOS OPERATION

Season Sixteen: The Key to Time: Story One
Episodes: (1) (2) (3) (4)


The Doctor reluctantly accepts Lady Romanadvoratrelundar as his new assistant on the quest for the six segments of the Key to Time.


First appearance of The White Guardian.


Novelisation: Doctor Who and the Ribos Operation by Ian Marter —
            no. 52 in the Target Library

5B. THE PIRATE PLANET

Season Sixteen: The Key to Time: Story Two
Episodes: (1) (2) (3) (4)

5C. THE STONES OF BLOOD

Season Sixteen: The Key to Time: Story Three
Episodes: (1) (2) (3) (4)


This is the 100th Doctor Who story.


Novelisation: Doctor Who and the Stones of Blood by Terrance Dicks —
            no. 59 in the Target Library

5D. THE ANDROIDS OF TARA

Season Sixteen: The Key to Time: Story Four
Episodes: (1) (2) (3) (4)


Novelisation: Doctor Who and the Androids of Tara by Terrance Dicks —
            no. 3 in the Target Library

5E. THE POWER OF KROLL

Season Sixteen: The Key to Time: Story Five
Episodes: (1) (2) (3) (4)


Novelisation: Doctor Who and the Power of Kroll by Terrance Dicks —
            no. 49 in the Target Library

5F. THE ARMAGEDDON FACTOR

Season Sixteen: The Key to Time: Story Six
Episodes: (1) (2) (3) (4) (5) (6)


Last appearance of Romana I before her regeneration.


First appearance of The Black Guardian.


Novelisation: Doctor Who and the Armageddon Factor by Terrance Dicks —
            no. 5 in the Target Library