Alien enemy

Definition and stakes

Portrait of Frank Belknap Long Frank Belknap Long,  The miniature menace (1950)

“ Condemned without trial for his refusal to open fire on an alien space-craft, Ralph Langford had to be free to investigate the strange menace from beyond the stars! For if the alien were an enemy, then it would be the most terrible enemy men had ever encountered. ”
Source: Gutenberg

Raymond F. Jones,  The Alien

“ But there was life yet and he dared to hope as he spoke to their minds, insistent, commanding, forcing life and consciousness back into their nerve cells. He seemed to become aware of unknown powers of resurrection that dwelt within his own being.
His mission was complete. He returned to his own physical form and abandoned the abasic senses. He sat there in the huge chair in the control room, while those about him revived and life gradually returned to the dying ship. Of the enemy fleet there was no more, for it was descending to an Earth shorn of the hope of Galaxy-wide conquest.
”
Source: Gutenberg

Portrait of Mack Reynolds Mack Reynolds,  Potential Enemy

“ Roger Post was saying hesitantly, "Then it is assumed that the alien craft wasn't friendly?"
SupSpaceCom Michell indicated his disgust with an impatient flick of his hand. "Any alien is a potential enemy, Post; that should be elementary. And a potential enemy is an enemy in fact. Even though these aliens might seem amiable enough today, how do we know they will be in the future—possibly in the far future? There can be no friendship with aliens. We can't afford to have neighbors; we can't afford to be encircled by enemies."
”
Source: Gutenberg

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