Currently we have the following Alien tags for the movies:
And for the games:
And then there's the AvP crossover:
And there's the avp tag that should be nuked because it's the same as pool:1264.
There might be some other tags that I missed. Anyways, easy stuff first:
Alien Isolation has a colon so it should be renamed to Alien: Isolation. Alien vs Predator has an American-style period after the vs, so it should renamed to Alien vs. Predator.
Now the hard part :
We probably should have an umbrella tag for the Alien franchise. Alien_(franchise) seems like a shoo-in (or Alien_(series), which we can implicate Alien_(movie), Aliens, Alien 3, Alien Resurrection, Prometheus (movie), Alien: Covenant and Alien: Isolation to.
Alien vs. Predator... I'm not sure what to do about it. It is technically another subfranchise of its own, though fortunately we currently only have one copytag for it that seems to be used for the first movie. If we implicate this to Alien_(franchise) then it will beg implicating it to Predator_(series) too (speaking of, the Predator_(series) tag lacks implications from the other Predator copytags). And then if we turn this Alien vs. Predator tag into its own series tag (with other AvP copytags pointing to it) this whole thing will blow up into a messy web of implications.
This can also potentially open a can of worms with all the other messy cross-copyright crossovers that the Alien franchise is involved in. So, maybe we should just use the Alien umbrella tag only for non-crossover titles, perhaps?
Updated