Of all the wild crossovers for Superman over the years, one of his craziest pits the Man of Steel against Alien's xenomorphs. Superman vs. Aliens — a joint effort of DC Comics and Dark Horse Comics — tested the hero's mettle against the extraterrestrial menaces. However, his «no kill» rule didn't do him any favors.
Releasing in 1995, this crossover placed Superman in space thanks to a message that appears Kryptonian in nature. Alongside LexCorp, he goes to uncover the mysteries of the message — and finds himself engaged in battle with more fearsome foes than he could've anticipated. Like Batman, Superman has implemented a «no kill» rule and in this series, it may not be one of his best ideas. In fact, it creates more problems than benefits since his foe has no mercy.
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Superman vs. Aliens, also known as Superman/Aliens,has the creative team of Dan Jurgens, Kevin Nowlan, Gregory Wright, Android Images, and Bill Oakley. Superman has trauma from killing three Kryptonians in a pocket universe. He reflects upon the experience before his eventual encounter with the xenomorphs. Despite learning how deadly the creatures are, he still refuses to employ deadly force, which ultimately has disastrous consequences and could have had even more were it not for the presence of LexCorp management.
Despite finding a colony of people trapped by xenomorphs, Superman continually tries to incapacitate the creatures with his weakening powers. He is far from the sun and the strength of his powers isn't what it usually is. So not only does he refuse to kill a deadly foe that wreaks destruction across the universe, he also does so when he's far less capable of quickly eliminating the
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