"The Ark in Space"
The plot is a return to "base under siege", but you wouldn't know it thanks to the innovations and creativity. This plot, fairly thin, relies more on a build-up of threat and a visceral feel. Placing the humans in cryogenic sleep as otherwise readymade victims helps a lot.
The show has covered 30th century colonies in the past, so the solar flares of which Vira talks about must have happened in the future and Nerva base converted into a series of survival chambers.
I's a shame the survival chambers are translucent because (a) the occasional actor waiting for their scene (Vira?!) blinks while the camera is focused in that direction, or (b) the translucency is just enough to reveal that most of the creeds and colors the Doctor mentions don't exist. (At least, in that room we do see - there's clearly a corridor that hints at others, on those occasions the set designers remembered to put back in the mirror in the back to suggest more pallets in the background.) A shame indeed, even more so since Vira
was supposed to be played by a black actress to help exemplify. A big shame as it would have helped the story so much more.
That same linked article also says how the actor playing Lazar was upset over one of his scenes being cut (by the producer, citing it was too morbid), and yet - given how Lazar and the other defrosted humans act - Lazar showing open emotion in a way antithetical to how humans behave as of their original century probably would have hampered the story's credibility at portraying future-humankind. This is exemplified by Vira talking of the Doctor and crew having a certain "romanticism" as if she were a scientist talking with bacteria in a petri dish, never mind Lazar's talking of
regressives and other factors, so you have that as well..
Robert Holmes has a unique grasp on character dialogue, nuance and prose that has yet to be matched. His handling of the trio of heroes plus the awakened humans may be as compartmentalized as humanity itself was, but it's so well done. Right down to "Granovox Turbines" and a subtle in-joke with "Bennett Oscillator", a nod to director Rodney Bennett.
He must also like Star Trek since the freeze-dried humans are in different colors, which seem to have in-story continuity as to what color means which. Then again, we don't have too many waking up either.
That aside, and it takes some headcanon, the first Wirrn invader is just lucky enough to choose the lead technician's body to feast on after being electrified, which then allowed it to figure out how to turn off the correct systems (alarm clock, electric guards) without disengaging the power to the sleeper chambers... then again, there's one scene where the power is shut off (audible hum ceases) so one has to wonder how all the remaining humans are surviving without the machinery, but let's example this:
- Nerva was said to have been built around the 2900s, or 30th century (a guesstimate by the Doctor, also not quite confirmed in "Revenge of the Cybermen" as the Doctor cites an earlier period in time and with some different equipment in the beacon)
- At some point, solar flares were predicted so the beacon was converted and everyone became literal popsicle sticks to go along with their popsicle stick personalities
- The first Wirrn stops by by chance (don't ask how far away it came to Earth from the last planet it visited)
- Wirrn then gets zapped and cuts power to the autoguard systems, taking out the alarm clock system as well.
- Let's say the clock was set to 10,000 years since the prediction was 5,000 years before the Earth could be viable again. Or even set at 5,000 years at bare minimum, meaning around the year 8,100 (80th century).
- Doctor cites their systems must have been off for several thousand years, so they could be in the 160th century for all anyone knows.
- What is the real time gap between the first Wirrn coming in and the rest incubating, which doesn't manifest until a later scene in the story where we see a lot of Wirrn cocoons in the rear of the power room. Would this one Wirrn sit around for thousands of years doing nothing? Maybe I missed a scene, but there's otherwise a slight disconnect in the story.
- Wirrn then goes to deposit its eggs in an unlucky human redefining "getting lucky", and creating a plot problem since the Wirrn didn't know about how the station's innards and gizmos worked until after ingesting Dune, which took place after cutting the wires to the autoguard system
- Wirrn then hides in a cupboard and finally dies, hoping nobody with groovy sideburns would ever open the cabinet door
The Doctor keeps a cricket ball on him for reasons. He also apparently has brandy in the TARDIS in a cupboard somewhere, as if nothing else exists to get Sarah turned around after nearly being asphyxiated.
Much is said against the bubblewrap used as skin material for the Wirrn grub. It's generally not bad at all and only one scene reveals translucency to see the actor within (it's also in a CSO effect, albeit a good one). Even then, the low-tech origins would not have been seen on a standard low dot pitch CRT TV circa 1975 and the costume design surprisingly holds up. If anything, dying Vaseline green and smearing it onto the costume might have worked better, but that would look really gross too.
Pretty much a fresh new trendsetter that would be a possible influence for "Alien" and other movies/shows, even the Borg in a way as the Wirrn assimilate others by depositing eggs on or in their victims, which then take them over and right down to absorbing their knowledge to become more unstoppable, this one really is one of the show's all-time greats...
Even with the whiny nitpicks, the story is still an easy 10/10 for its verve and execution and philosophical themes alone, the character nuances make up for other aspects.