I agree with Velhart,
I think that futuristic tech or even that of modern doesn't fit with the fantasy theme of talisman. Does a knight fighting a futuristic commando really make sense??
To be fair, there are genres within genres, sub -genres within… etc.
For example, one of the most beloved, awarded science fiction writer, Andre Norton, wrote the incredible Witch World series, which is basically a medieval-ish fantasy world. But right from the beginning, people from "real Earth" (it is unknown what planet the Witch World actually is) travel through 'gates' or portals that seem equally tech or fantasy, clearly not necessarily one or the other. Several novels into the series some characters travel from the Witch World to a desolated and destroyed future world - clearly not their own, ever.
But on the whole, I agree with a previous poster who indicated that perhaps the stray character or two is okay, unless of course an actual board "explains" the relationship *in-world* between the other/main boards and one that seems discordant.
I think I too would not buy a board/expansion that featured the American Wild West, but I would be okay if future sets included 2, maybe 3 cards that appear to be time travelers, that came to the T world. Since many encounter cards have the exit out(discard) once an effect has happened, these cards wouldn't dramatically alter the game..
example: If a time traveler shows up (kind of like the Dr.Who-ish person in the old Timescape), maybe he offers to change the day/night card to the character's preference. Maybe another type of time traveler can alter alignments. Another could remove, enhance, or alter dragon scales.
Maybe another time traveler, as your companion, or some device he gives… could allow a player to pick a different alt. ending? (only when hidden are used?).
I'm sorta different from many posters here; I would like to see MORE integration between elements of the various expansions.
I want to find secret Keys (trinkets, basically) that allow you to find secret passages to take you from the Castle to the Dungeon, or the Chapel to somewhere else. Things like that. Maybe there could be other kinds of quests with other rewards? Encounter cards that 'give' an obligation to take certain objects to certain places, to receive new rewards or enhancements. Okay, thats what I want, but I guess I mostly agree with everyone, just a little is okay.