Planet X-29 [life detected]

An alien race that's set on colonizing the cosmos. They also have a special way of dealing with any life detected on a planet. They send one of their own down in a base disguise of the most intelligent form of life, that they know, is.
When they see what the life down is like they will plan accordingly. This can sometimes be an end in death or injury. To who is a matter of waiting to see.