Nearly every species inResident Alienhas been proven capable of one very specific trick, but it’s something the Greys are incapable of. The show portrays extraterrestrial life as far more advanced than humanity, not only in technological advances, but also from a biological standpoint. However,Resident Alien’s Grey Aliensonly really have Earth’s native species beat on the tech side of things. Regardless,Resident Alienseason 3’s endingproves showrunnerChris Sheridan isn’t ready to move on from the enormous threat the Greys poseto Earth.
Alan Tudyk’s Harry Vanderspeigleand his people have an unpleasant relationship with the Greys, as they have a long history of being at each other’s throats. Given the size of the galaxy, it’s unsurprising that the show’s spacefaring species have developed dynamics of this sort, but the scale of the inky void also makes it far more surprising that nearly every alien can do the same thing - other than the Greys.

The Greys always appear in their known form
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The show gives the Greys an alternative way of blending in with humans. Instead of physically transforming,the Grey Aliens created Grey/human hybrids to serve as their operativeson Earth. The hybrids all look exactly like regular humans, albeit very attractive ones. The development of the cross-bred species was to aid in the Grey’s surveillance and eventual domination of the planet. Their ultimate goal was to transform Earth’s atmosphere, as it’s unsuitable to support pure Grey life. It’s an elegant solution, despite being for a nefarious scheme, but it’s also far less streamlined than shapeshifting would be.

Why The Greys Can’t Shapeshift In Resident Alien
The showrunner has tried to keep the race’s depiction as faithful as possible to folklore
Despite appearing in a sci-fi dramedy show, the Greys are based on genuine accounts of those who believe they have experienced contact with alien life. Weirdly, these individuals all tend to arrive at the same physical description of the beings that took them. In short, the Greys inResident Alienare a canonized version of how the race has been depicted for decades in real-world folklore.Shapeshifting isn’t generally believed to be within their skill setin these stories, soResident Alienhas also withheld that ability from the race in the show.
Resident Alien
Cast
A television adaptation of the comic book series, Resident Alien is a sci-fi comedy that stars Alan Tudyk as an alien who crashes on Earth with one mission - destroy humanity to save the planet. When Tudyk’s character takes the identity of a doctor, he arrives at a small town and begins to act the role preparing his plan. As time passes, he develops human emotions against his will - but his plans are further complicated when he meets the son of the mayor - who can see his actual appearance.
