Second film starring Sigourney Weaver as Ellen Ripley (6)

I believe the answer is:

aliens

(Other definitions for aliens that I've seen before include "Forms of life assumed to exist outside Earth" , "Beings from another planet" , "Strange forms of life" , "Life-forms assumed to exist beyond Earth" , "Strangers, extraterrestrials" .)

I've seen this clue in The Times and The Sunday Times.

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