Doctor Who (1963–1989)
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The Power of Kroll: Part One 

The TARDIS arrives at it's next destination, the marsh planet "Delta Magna". Where the Doctor and Romana goes in search of the fifth segment to the Key to Time. Where they discover the ... See full summary »




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Episode complete credited cast:
Neil McCarthy ...
John Abineri ...
Glyn Owen ...
Carl Rigg ...
Frank Jarvis ...
John Leeson ...
Grahame Mallard ...
Terry Walsh ...


The TARDIS arrives at it's next destination, the marsh planet "Delta Magna". Where the Doctor and Romana goes in search of the fifth segment to the Key to Time. Where they discover the native tribal Swampies worships Kroll, a gigantic squid as a god, only to find Kroll has accidentally swallowed the fifth segment and Romana is chosen by the Swampies for sacrifice and The Doctor sets out to save a local refinery from being attacked by Kroll. Written by Daniel Williamson

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Release Date:

23 December 1978 (UK)  »

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Technical Specs


Sound Mix:


Aspect Ratio:

1.33 : 1
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Did You Know?


The Swampies' make-up s made green using a German product selected by make-up artist Kezia Dewinne for its striking appearance on camera and its resistance to water. Unfortunately, Dewinne had neglected to order the special solvent needed to remove the make-up. As a result, once shooting had wrapped for the day, some of the actors had to be despatched to RAF Bentwaters at Woodbridge to take chemical showers, while the remainder had their skin scoured by hand at the hotel. Despite these efforts, many of the Swampie actors would sport a green tinge for weeks afterward. See more »


Romana: Oh, it's a sort of Holy Writ?
The Doctor: It's atrociously writ.
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Badinerie: Orchestral Suite No. 2 in B Minor, BWV 1067
Composed by Johann Sebastian Bach
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User Reviews

It's OK so far, solid opener
20 August 2015 | by (Swansea, United Kingdom) – See all my reviews

The Doctor and Romana are searching for the fifth segment to the key to time, they land on the very green and marshy Delta Magna. We hear rumours of Earth people arming and helping the Swampies (the natives) against the ruthless human conglomerate mining methane on Delta Magna. The natives worship their God Kroll and are soon to sacrifice a captured Romana to it.

I realise that this is considered one of the weakest of Tom's outings, and the worst in the key to time saga. It's been a while since i've seen it so here goes.

The Swampies look a bit dodgy, little green men syndrome, they aren't too badly realised just a little bit clichéd.

The locations look particularly good, and the sets of the refinery look pretty good too.

It's seemingly a story of the good guys and the bad guys, but which are which, it's thus far a more grown up story, definitely more so then Ribos and Pirate Planet.

I've enjoyed it more then I thought, my memory of it was not good, but it wasn't half bad, feels a little like a Pertwee story, the hover crafts etc, but not bad at all, 7/10

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