I just had a side thought:

“It’s only a trilogy if it has the same protagonist”

“What about the Cornetto Trilogy”

“…”

May not quite answer your question, but when I think conservative I think less government interference.

Keyword my perspective, views of actual conservatism vary. So my thoughts would be instances where not having as much of your info be public, censorship, and mandates. Mandates is touchy, so what I am thinking is there should not be a vaccine mandate because everyone should be educated enough to understand how beneficial vaccines are and there is no need to force people since they’ll do it anyway.

Maybe an instance would be that Deep Space 9 episode where the federation tries to take over the entire Earth just because of a changeling threat?

Half life wise, could you also consider HL2, HL2 all episodes, and HL Alyx as a trilogy?

Portal Revolution to me is the third game. Not the best, but considering it’s free it fits as a way to complete the series.

You could say Portal Revolution is the third game (it’s free direct from Steam, and while not wildly unique it will still have you scratch your noodle until you realize how obvious it is).

So I vote Portal in that case.

Single Player on Heroic or below.

You are in for a little treat 😊

Animated series plus you could consider the Telltale Games BttF the fourth movie, as it was written by Gale and has most of the cast. (MJF makes a cameo, Biff’s actor said his agent never contacted him)