War of the Worlds Season 2 Episode 20

Throughout the second season, the scenes either appear to be filmed at night or on overcast days in order to give the appearance of severe air pollution. Why does the sun suddenly appear after the aliens are defeated? This season's intro seems to indicate that the aliens had nothing to do with the Earth's pollution problems. All I can figure out is that it's symbolic.

In this episode, it's established that Malzor and Mana had to chose the best of their race to travel to Earth because of the lack of spacecrafts or resources. Why then did they execute the aliens that were left over from the 1953 Invasion? The first season stated that tens of thousands of aliens were left over from the previous invasion. Why not utilize their numbers as foot soldiers instead of wasting energy by executing them which causes a depletion of resources even more?

In the episode "The Second Wave" the original aliens were refered to as soldiers. Then in "Time To Reap," Malzor makes reference to either 1953 being the year of a war or those aliens as warriors (can't quite make it out, but some variaton of "war" is heard). So with this in mind, why are they now referred to as scientists and being on a research mission?

The references of the 1953 movie conflict with all of the aliens' intentions here. It just doesn't make sense as to why a research crew would open relentless fire on sometimes unarmed creatures or why they sought to destroy anything and everything in their path. The impression from the backstory was that they were not a hostile race (made most evident by Malzor's mate), but yet they seem to be irredeemably violent during their so-called research mission.

Denis Forest gets shot at by Jared Martin and tells the two men with him to get down. A few seconds later, Denis Forest flees to a waiting car. The problem? There is now only one man with him even though you never see the other man get shot.