Was it absolutely necessary to land in a quagmire?
When a Doctor Who story from the 1970s involves tentacles, it’s a safe bet that Robert Holmes wrote it. His second entry in Season Sixteen’s Key to Time arc, “The Power of Kroll” (Story Production Code 5E), involves the largest squiggly appendages in the series to date, belonging to Kroll itself, a giant squid made gargantuan through the transmutative powers of the fifth segment of the Key to Time.
But it wouldn’t be a Robert Holmes story without some commentary on social, economic and/or class divisions as well, and this story centers around the exploitation of the People of the Lakes, a small band of descendants of the indigenous green-skinned humanoid inhabitants of the planet Delta Magna who were resettled on a moon by colonists from Earth thousands of years ago. With the discovery of huge pockets of methane gas on the moon, though, a corporation has set up a pilot methane catalyzing refinery to produce massive amounts of compressed protein, needed to feed the masses on Delta Magna. If successful, the subsequent swath of refineries will wind up displacing the People of the Lakes—demeaningly labelled “swampies” by the humans—yet again.
The Doctor and Romana arrive on the unnamed third moon of Delta Magna in search of the fifth segment of the Key to Time, which registers as a diffuse presence on the scanner, as though it were all around. A case of mistaken identity sees the crew of the refinery attack the Doctor, whom they mistake for the scruffy, broad-hatted Rohm-Dutt (Glyn Owen), a gun-runner delivering weapons to the People of the Lakes. While the People of the Lakes think that the Sons of Earth, a group on Delta Magna sympathetic to their cause, have supplied the worn-out rifles, in actuality the leader of the refinery, Thawn (Neil McCarthy) has hired Rohm-Dutt to supply useless arms to the “swampies” to encourage a futile uprising that will allow them to be wiped out in the name of self-defense.
The plan would have worked, except for the minor issue of the refinery drilling operations awakening the slumbering Kroll, whose metabolic functions during its long hibernation caused the methane build-up so valuable to the humans. Originally one of many giant squids transplanted from Delta Magna along with the original People of the Lakes, Kroll ate a high priest—and along with him the People’s holy relic, the fifth segment of the Key to Time in disguise—centuries ago and grew to enormous dimensions, almost a mile across, as a result. It attacks the People of the Lakes as they wait in ambush for the humans, chomping one of their number as a post-slumber snack.
Their leader, Ranquin (John Abineri), decides Kroll’s malevolence stems from the presence of the “dryfoots,” the Doctor and Romana, who have mocked Kroll’s power via Romana’s droll anthropological observations about their ritual practices. Ranquin orders our time travellers, along with Rohm-Dutt, whose treachery has been discovered, executed via the seventh holy ritual of the Great Book, the longest-lasting and worst of them all: spine stretching via contracting creeper vines. And how does the Doctor manage to escape? He sings…