An Alien That Lives On Earth???

E.T. was living on Earth. Others have taken up residence here: What about "The Man Who Fell to Earth", "The Brother from Another Planet" and others who end up assigned or stranded here? There have been many SF films and series about aliens living on Earth, not just dropping by for a quick visit. "The Abyss" showed that they aren't always humanoid visitors. Of course, I'm not sure if "The Abyss" suggests that they've been here for a while.

Personally, I'd have loved the creatures in "The Abyss" to be native to our oceans, a civilization we never knew about.



*** The trouble with reality is there is no background music. ***

Well if you wanna get technical, an alien is just a creature different from us.

Now extraterrestrial, that's pretty explicitly NOT something that can come from Earth.

The monster looked like it evolved on Earth; it's a giant arthropod, something that could have existed during the Cambrian Era (http://en.wikipedia.org/wiki/Cambrian_explosion).

I think the monster is described as an "alien" in the tagline because:

A) It's bad marketing for a movie no one cared about.

B) the monster lives deep underwater and is completely unlike anything else on Earth.