[wastedyears]

From what series or realm does this vessel belong to?

[KarlInOhio]

From what series or realm does this vessel belong to?

The movie Alien.

It's an extraterriestrial organism of peace.

[agere_contra]

From what series or realm does this vessel belong to?

Fragmentary Clue - "In Space, No-one..."

[ClearCase_guy]

Alien. Film by Ridley Scott. Lt. Ellen Ripley (Sigourney Weaver) eventually blows up the Nostromo in an effort to destroy the alien that had been inadvertantly picked up while responding to a distress beacon.

In the follow-up movie (Aliens), Ripley is put on trial for the senseless destruction of company property. A company employee (played by Paul Reiser) explains to Ripley that an M-class starfreighter "Is a very expensive piece of equipment".