I've been watching all the Alien films lately. I intend to rewatch Alien3 "Assembly Cut" soon to commemorate the anniversary.
The first footage I ever saw of a Xenomorph was the Runner/ Dragon in Alien3. My mum covered my child like eyes with a blanket at the gruesome parts. I did get to see the climax (Theatrical Cut).
I wouldn't see the full length theatrical cut till years later.