There are adults still alive, but severely isolatedThink about it, no matter how amazingly fast and good at spreading this virus was, there still are some very isolated places in the world, some of the most remote would be the Antarctica, Greenland, Iceland, Siberia, Sahara... So unless the virus was exceptionally suited to extreme cold or heat, able to traverse large bodies of water or desert, it simply would have not been able to kill off all of the adults.
- Since we never see anything but the one small corner of the world the show is set in, this is entirely plausible. The only hint we have that there's no-one out there is the fact Jack can't pick up any transmissions from his shortwave radio, but all that means is that no-one's capable of transmitting (or Jack simply has a run of bad luck and misses any possible transmissions).
The Tribe is set in the future of the same universe as Outrageous Fortune.
- Trudy is Jane's daughter, as the Identical Granddaughter is in effect, skipping a generation each time. Her personality is similar to Rita and Loretta as well.
The Tribe is set in a weird Alternate History...This is to explain the Canada Does Not Exist. Basically it's one with a surviving British Empire which later became a republic and in which America never became independent. So they had a President, British money, American-twinged accents due to migration within the former Empire, and somehow set up the new capital in New Zealand as its far enough away not to be easily invaded in time of war. It's colloquially called "The City" simply because it's so important no-one needs to refer to it by its actual name. Somehow the Alien Space Bats made sure this alternate world at least superficially resembled our own.
The Technos' advanced technology was salvaged from a secret military research facility.Ram might be a demented Teen Genius but there is no way he and the other Technos could have come up with advanced virtual reality and the zappers all by themselves with what limited resources were available to them; there is no way they could run that on civilian 1990s computers either. It is way too advanced for that.
- It's been a while since I saw this series, but as far as I remember you are correct. It was at some point elaborated on that their sonic guns for example were from a military lab - and my memory might be failing me on this one, but also I think irreplaceable; Repairable to a point but they can't manufacture more. Ram was the son of a scientist working in said lab.
Zoot is a demonic entity that possessed Bray's brother Martin.Martin opened himself to Zoot's influence, taking on its persona, after the inability to cope with the death of his father, giving him a way of coping with the breakdown of the old world. After Martin's death, the entity Zoot's influence continues to haunt the City forever after, from the Chosen to Ebony's artificially-induced visions to Ram's AI in Zoot's likeness.
Season 5 is a Shout-Out to post-9/11 conspiracy theories.As it was made in 2003, it's late enough for this to work. You have a militant group of religious extremists (the Zootists) and Mega and the Technos seeiking to exert more and more control measures (via technology) with the excuse of counteracting the threat they pose. Does This Remind You of Anything? The fact that Mega even goes so far as to force everyone to wear barcodes on their wrists is reminiscent of earlier theories which claim that barcodes were a precursor to the "Mark of the Beast". (Christian end-times prognostications often tend to overlap with conspiracy theories online...)