There is no interstellar or intergalactic travel in Deadman Wonderland (fan-fiction only).
There is no interstellar or intergalactic travel in Code Lyoko (fan-fiction only).
There is no interstellar or intergalactic travel in the Big O anime (fan-fiction only).
You need a large amount of liquid naquada and parts to build the gate but you also need a DHD plus a power source for interstellar travel. A Zero Point Module (ZPM) or equivalent power source is required for intergalactic travel.
Interstellar would mean about "from Star to Star". We don't have anything that can travel that far.
# Homesickness
Answer #1: My prediction is 'no'.
No. To do that would require interstellar travel, which we are not capable of.
We need a suitable drive for interstellar travel to go that distance.
Space colonization or interstellar travel. Making money.
It isn't completely clear what you mean with "interstellar aliens": aliens on planets surrounding other stars, or aliens capable of interstellar travel? In any case, it is currently unknown whether ANY life exists in other places of the Universe; whether it is aliens capable of interstellar travel, or even just bacteria on other planets. It seems likely, given the huge amount of planets in the Universe, that there is life somewhere else than Earth - but this hasn't been confirmed yet.
If you say so, my friend.
Because there is no evidence such a thing is even possible.