The Power of Kroll

No. 16 of 184 in the BBC classic series DVDs/Blu-rays series
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Starring: Tom Baker, Mary Tamm & John Leeson
By:Robert Holmes
Rating:   6  (26 votes)  Vote here
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Editions:  US US (standard DVD) | US US (special DVD)
Description:  DVD release of the 1978-79 Doctor Who TV serial of the same name — the fifth story in the Key To Time season. Only available separately in the US — in the UK and Australia it was instead released as part of The Key To Time box set.

Cover image for The Power of Kroll
Edition: US US (standard DVD)
Released:  October 2002
Publisher:  BBC Video
Format: 1 x DVD
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Cover blurb:
The search for the fifth segment of the Key to Time brings the Doctor and Romana to the swampy terrain of the third moon of the planet Delta Magna. Almost immediately, they become separated. The Doctor draws fire when he is mistaken for Rohm-Dutt, a notorious gunrunner wanted for supplying firearms to the Swampies, an aboriginal people who were displaced to the marshy moon when human colonists took possession of Delta Magna. A small team from Delta Magna are now developing a refinery in the Swampies’ promised territory, but the Swampies are confident that, properly armed, they can drive the humans away.

Meanwhile, Romana has been captured by the Swampies and prepared as a sacrificial offering to their god, the mighty Kroll. Thwarting the sacrifice (in which the god was nothing more than a Swampie priest in fancy dress), the Doctor and Romana have incurred the wrath of Ranquin, a fanatical high priest to Kroll. Legendary or not, something is stirring beneath the swamp floor and, if the refinery’s instrument readings are correct, it measures five miles across!


  • Commentary by actors Tom Baker and John Leeson
  • Pop-Up Production Notes
  • Photo Gallery
  • Who’s Who

Cover image for The Power of Kroll: Special Edition
Edition: US US (special DVD)
Title:  The Power of Kroll: Special Edition
Released:  March 2009
Publisher:  BBC Video
Format: 1 x DVD
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Cover blurb:
Searching for the fifth segment of the Key to Time, the tracer brings the TARDIS to treacherous swamps on the third moon of the planet Delta Magna. The Doctor and Romana soon uncover a plot to wipe out the Swampies, the local inhabitants, by the duplicitous crew of a gas refinery.

Meanwhile, a massive creature is stirring beneath the waters, and the primitive Swampies believe the only way to calm the powerful monster is human sacrifice.


  • Audio Commentary by actors Tom Baker (The Doctor) and John Leeson (Dugeen)
  • Variations Location visit from BBC Archive (6 mins)
  • In Studio A glimpse into the studio recording of the story (11 mins)
  • There’s Something About Mary Mary Tamm looks back at her season as Romana (9 mins)
  • Philip Madoc — A Villain for All Seasons Retrospective of actor Philip Madoc’s numerous roles in Doctor Who (9 mins)
  • Continuities (3 mins)
  • Photo Gallery (5 mins)
  • Production Note Option
  • DVD-ROM PC / Mac feature: Radio Times billings
  • Digitally remastered picture and sound quality

Originally transmitted December 23, 1978 - January 13, 1979

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