The UnXplained Special Presentation S01E06 - Signs of Alien Life

Is it possible that other intelligent species exist in the universe?  If so, is there evidence of these extraterrestrials hiding in plain sight?  From UFO sigthings by the military, to strange structures on Mars, the evidence is mounting that we may not be alone.  But if extraterrestrials exist, what are their views toward humanity? And should we see them as friend...or foe?