Trashing something that others are enjoying.
Condemning parts of the franchise instead of reasonably stating a personal preference. This is a comfortable space for all fans. Keep your critique.
Invalidating other people's opinions.
Unsolicited criticisms of other's creations.
Lewd or obscene comments.

No low effort / quality posts.

Post quality is determined by mod discretion, and is not up for debate.

Examples:

Critique / Complaint posts.
Ranking / Comparison posts.
Low quality / interest memes.
Uninteresting merch pics. T-shirts, stickers, etc.
Video game issues or gameplay.
Statements or questions that don't inspire conversation and can be researched on your own.
Links to unpleasant websites.
Low effort art or works in progress.
News without sources or rumors and misleading information.

No spoilers or leaks on recent content.

Absolutely no leaks.
If you want to post a spoiler, keep the TITLE spoiler free and use a spoiler tag.
Spoiler comments on a spoiler-tagged post are allowed. If the post has no spoiler tag, you must use the spoiler-text formatting. example
Questions about possible spoilers must also adhere to the rules.

No AI or "Looks like it's from Alien" posts.

AI generated content is not allowed.

Things that look like they are from, or inspired by, the Alien franchise: menacing staplers, crabs, cabbage fields, etc., are not allowed. Similarities and imitations are everywhere and it's a tired subject here.

Tag NSFW franchise content.

No pornographic content or real life violence. If a NSFW post is reasonably applicable to the franchise, it must have a NSFW tag.

No merch links, piracy, or self-promotion.

Reddit is not a secure marketplace. Scammers are everywhere. Protect your property by using watermarks or taking IRL pictures of your creations so they can not be replicated. If someone requests a link, you may send it in DMs only.