Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

According to IMDb:    Aliens are far more dangerous, they have no fear, can lose most of  their limbs and still pose a major threat, they have acid blood, can  kill with their claws, tails and teeth and can see predators even when  they're cloaked.   I've never heard that they can see predators, especially when they're cloaked...  Are there direct references/examples to this in any of the AVP movies?
Can Aliens see cloaked predators?

    In the episode The Raiders Minimization of The Big Bang Theory Amy ruins Raiders of the Lost Ark for Sheldon by making the following claim:   Indiana Jones plays no role in the outcome of the story. If he weren't in the film it would turn out exactly the same.    [...]    If he weren't in the movie the Nazis would have still found the Ark, taken it to the island, opened it up and all died... just like they did.   Well, the Ark ending up in the warehouse (probably) wouldn't have happened without Indy, but aside from that, would Belloq and the Nazis have met the same fate even without Indy's meddling?  My question:  Is Amy's assertion correct, did Indiana Jones play no role in the outcome of the story?
Is Amy right about Indiana Jones being irrelevant to the outcome?

While reading his wiki page it says that: Running alongside his enthusiasm for DVD, Scott is sometimes considered the "father" of the director's cut, though the impetus to produce such versions has sometimes begun with other parties. The positive reaction to the Blade Runner Director's Cut encouraged Scott to re-cut several movies that were a disappointment at the time of their release (including Legend and Kingdom of Heaven). Today the practice of alternative cuts is more commonplace, though often as a way to make a film stand out in the DVD marketplace by adding new material.  Blade Runner was his first Director's cut but he has made many since. It seems he has the most Director's Cut Editions. Also it seems that he does a lot of Director Cut because his movies are changed by studio input after test screenings. So does his making of so many Director's Cut actually hurt the movies ( since the original movie is no longer the definitive version) or help them by creating more layers?

Does Ridley Scott's Director's Cut releases hurt his movies?