Movie from the 90th i think or maybe 80th with interdimensional aliens

whats this movie where a military officer and an expert women are traped in some sort of organic alien lifeform connected to it with organic tubes and was discussing about 4th dimension?
they mentioned in the movie or film series that there is another interdimensional alien rivaling the organic kind.

Sounds mostly like some Dr. Who episode. But military officer... hm not sure.

Check out this British mini-series from 1998:

Invasion: Earth

Thats it Invasion Earth