Robert Keegan

On a mission to collect the six segments of the Key to Time, the Doctor and Romana travel to the planet Ribos where the first segment is protected by the monstrous Shrivenzale.

Garron is attempting to trick the Graff Vynda-K into buying the planet Ribos, but the jethrik that is vital to his plan is really the first segment of the Key to Time.

The Doctor and Romana's search for the first segment of the Key to Time is hampered when the Graff Vynda-K takes them prisoner.

Pursued into the catacombs by the Graff and attacked by the ferocious Shrivenzale, the Doctor and Romana struggle to stay alive and find the first segment of the Key to Time.